This isn't a review so much as throwing my throwing 2cents into the "great little DAC for the price!" pot.
I think if I was starting out and I needed gear, this with the magni, or the Asgard, would be my first choice.
 
I use this at work with the PSY RCA/USB cables. They are plugged into a Schiit Lyr with some nice Russian tubes.
I usually this setup with the HD650, sometimes the LCD2.2
 
It sounds really good from old MP3 VBRs all the way up to 24bit FLAC files.
As noted, it pulls out detail quite well. It's not as revealing than the NFB 3.1 I have at home, but then again, it's 5% of the size!
I much prefer it over the Fiio E17/E9. (Which were nice... but now that the magni/modi are here...)
 
At some point I'd like to compare a higher end Schiit DAC against the Audio_gd NFB 3.1.... ^^

DISCLAIMER: I don’t have ‘golden ears.’
 
TLDR;
Strong points: Some isolation. Bass/energy. Soundstage is GREAT. Good attack/delay on notes. “Fairly” controlled bass. Nice non-forward mids and crisp upper mids-lower highs. REALLY easy to drive ,you can plug it into your iPad (with an adapter) and it sounds good. It scales with a good amplifier, naturally, but not as much as the HD650 or others.
 
Weak points: Treble extension. Minor sound leakage, isolation from outside sound is low. Large. Not as large as the MDR R10, but only a little bit smaller than the DRM XB1000. Bass guitars dominate this headphone. You should also baby the cable as it handles like solid-strand copper. Overall, more of an at-home headphone, while useable at work, it would shine in a quiet environment while being decent in a noisy one.
 
Recommended Use: At home. Or dorm room, given the sound signature of this headphone. It would be right at home at a code monkeys desk with techno pouring out through it. It’s not really a work phone due to poor isolation. It’s not at all a mobile headphone.
 
 
THAT'S IT?; A bit of detail
Soundstage: Amazing. (for a closed headphone) The HD650 sounds a more open, but then again, it IS a bit more open.
 
Bass: Lots of energy. Pretty well defined, and it doesn’t overpower the mids/vocals, but it feels like it has a lot of energy to it. I chose these over Denons older & newer D- line. (I wanted a closed bass headphone.) It manages bass very well, with one caveat. When there is a bass guitar that is mastered “forward” to take a large part of the song, the headphone takes that bass guitar and makes it the star of the show. It doesn’t destroy the synergy of the other instruments, but it certainly eclipses them.
 
Mids: Good. Not as comfortable, or as warm as the HD650, but on songs with less bass and more mids, the mids on the phone present themselves well. Guitar-only tracks (acoustic) sound lush and full. In part because the lower notes really get a lot of energy from the lower spectrum.
 
Highs: Listening to the same electronic track on both the HD650 and the DX700, parts of track came across a bit shrill on the HD650, while I didn’t notice it at all on the DX700. This is both good and bad. On songs with sibilance or if you notice these things (the T1 was always a bit to shrill for me until I got the WA2) it can be good. The downside is that I feel it drops off the highs. They are present, but not to full extension. You wouldn’t listen to this for complex pieces of orchestral work.
 
Isolation/leakage: Poor. Not as bad as open headphones, but don’t use it in a quiet environment without expecting someone else to be able to guess what you are listening to. Also note… it sounds best in quiet environments due to low isolation.
 
Comfort: Not bad. Not great. The MDR-1R is more comfortable, as is the T1. They aren't as heavy as the LCD'2, and they have less clamping force than the HD650. In short, they are huge-leather padded headphones that you can wear for long periods, but you'll never forget that you have large leather-padded headphones around your ears.
 
Verdict: Great for Rap, electronic, bass heads who want a bit more refinement, guitar pieces. Non-complex songs with mids/highs, or well-mixed music that caters to energy/bass for the conveyance of emotion in the song. I wouldn’t pay $700 for it, but then again, I didn’t.
I think the Mad Dog Alphas might be worth it over these. As much as I enjoy the DX700, I would probably trade it for the Alpha… unless you are really into bass, then check those out! Because of some of the newer headphones that are out, for the average consumer, I would put the value of this headphone at a good deal around $400. (I like the wood, and the soundstage is great.)
 
 
MORE BLAH BLAH: (more words to say the same thing)
More on isolation: Isolation from outside noise when music is playing is ‘decent’ but if your turn off the music you’ll hear 90+% of the noise around you. At a moderate volume, with some outside noise someone standing within 2-3 feet of you will hear hints of what you are listening to at a low volume. In a quiet office, this might bother co-workers. So the ability to hold the music inside the cups isn’t that good if you want it in a quiet environment.
 
DX700 VS HD650 (and others): The DX700 is more immersive, more vibration/impact/energy, removes high-pitch sibilance while the HD650 is more airy, better instrument separation with all genres (though the DX700 is better on clear tracks with carefully mastered lower ends and less going on), and the HD650 hits the highs with more sparkle. Essentially, the DX700 has the characteristics of what you would expect from a closed can, but with a wide soundstage. The HD650 has that trademark musical mids, while the DX700 has great bass energy without resembling the messy rumble of a jet engine that Beats made their first headphones to resemble.
While it is, understandably, not as good as the T1/Woo WA2 combo it DOES have more energy on the bass side of things. The soundstage also is closer to the T1 than any other aspect of the headphone. Compared to the Lyr/LCD2, I actually prefer the soundstage on the DX700. For me, the Lyr/LCD2 doesn’t always hit that itch that I want to scratch when I reach for the LCD2… the bass. I actually feel it has better (or the same? This varies on the genre due to the soundstage of this 'phone) instrument separation than the LCD2 on clean tracks with less 'going on' in lower frequencies, though that is debatable. (Feel free to debate it. It may just be the soundstage playing tricks on me. Beautiful beautiful tricks.) I’d say the DX700 sounds similar but with more emphasis on bass. The bass is well controlled and impactful, but it’s brought forward. It sounds deep and resonant. The LCD2 is a better headphone, but it doesn’t have as much energy to the bass, and the DX700 beats it when it comes to soundstage.
 
Parting shots: The DX700 has lots of flavor, lots of color. It pairs well with Electronic or Rap with tight well mastered bass. The phones tend to bring out all the subtle inflections of a singers voice, but this can be masked if the song is mastered a certain way. The phones bring the bass up a notch. The bass overshadows the mids when the bass is ‘flowing.’ Not because it’s poorly controlled, but because “THE BASS MUST FLOW!” (So said some Japanese engineer when making these phones.)
 
 
SONGS; using the AQ Dragonfly with the H650s’ bundled ¼ adaptor
RECORD - Crosby, Stills & Nash by Crosby, Stills & Nash (Remastered, 96,400 24bit)
TRACK - “Marrakesh”: While it sounds good the bass is really brought forward. The highs and cymbals are crisp, but the voices sound a bit recessed in comparison to the bass. For some reason I can’t quite put my finger on the sound sounds a bit veiled.
TRACK - “Helplessly Helping”: sounds great with wonderful separation between the vocals. Perhaps due to the lack of bass the song feels more alive and snazzy.
 
RECORD - Dr. Chesky’s Sensational, Fantastic, and Simply Amazing Binaural Sound Show
TRACK - “Storms Are On The Ocean” (sung by Amber Rubarth): Ms. Rubarth sounds rich and velvety in this song, mixed in with the Chello and Violin, but what really steals the show is the vibrancy of the cello. When it starts to play, most of the energy is taken up by the cello. It doesn’t overpower the others, it is simply very present. The soundstage of the headphone coupled with the Binaural recording makes for a very immersive experience.
TRACK - “Pamafunk” (by The Brooklyn Funk Band): Wow. The bass here makes you feel like you are in a carpeted cave. A cave filled with vibrant bass, clear trumpet calls, and an excited electric guitarist. The bass in this song is like an ocean upon which the other instruments play upon. The trumpets really set sail on the fullness of the booming sound set up by bass guitar and drums. Due to the placement of the trumpets and the consistent nature of the bass in this song, the trumpets come out really forward and clear, taking the center of the stage as they were meant to. The bass guitar is a little fuzzy at times, making the whole thing very bassy and warm to listen to.
 
RECORD - Freedom Calling by Jake Hamilton (MP4 iTunes… yes, I know)
TRACK – “War Drums”: I like to use this song to judge the bass control on a song. Using this song as a baseline between the DX700, HD650 and T1, the mids come through but the mastering on the bass guitar in the mix really takes charge. There is a bit of fuzz on the extreme low end of the guitar, while all the drums come through distinctly. The hits on the rim are less sharp than on the HD650/T1.
 
 
POINTLESS BACKSTORY
I’ve had this pair since February and thought I’d write a brief review. I picked up my pair on sale in Akihabara while passing through Tokyo. They were on sale for about $480 for some reason. (The sign was in Japanese, perhaps they were clearing out old stock? They have a small ding on the left wooden cup, perhaps that’s why.) I demo’d them in the store along side the DX1000 (which was not on sale) but even with the comparison I preferred the sound of the DX700 over the DX1000. Actually, a little solid-state Audio-Technica amp at the store had the best synergy of anything I’ve since plugged them into. I wish I had written down the name of that little amp…
 
I mostly use the DX700 at work because I have the T1 and LCD2 at home. I put them through at least 70+ hours of break-in before I started using them. The other pair of headphones I keep at work is the Sennheiser HD650. Due to sound leakage, I don’t get to use them often, as usually I have people in the cubicles around me. The dac/amp at work is currently the Fiio E17, E9, and AQ Dragonfly. (limited space) At home I’ve used it with the Audio_Gd NFB 3.1 plugged into the Schiit Lyr/Woo WA2. (Both have some nice tubes in them.) At work the line out path is USB, at home it’s optical. Files are Flac/MP4, with JRiver Media Center 18. (Which I found out about at Headfi. Like I did with almost every piece of audio gear I own. Thanks guys.)
 
 
EDITED: 2013/11/22 Edits are underlined. Because the DX700 seems to have good seperation most of the time, but gets jumbled in some genres, especially with lots of lower frequency energy going on, I made some erroneous statements. This is fixed.

DISCLAIMER: I am not an audiophile. This review is for ‘normal’ ears.
I received this unit from Dunu in exchange for a review. While I appreciate the opportunity, honest feedback is the best thing I can give to Dunu in return for the chance to review the DN-19.
 
After initially listening to the DN-19, I put it aside and let burn in over 100 hours on my iPod nano. After letting it burn in a bit, I resumed listening to the earphones and was initially very disappointed. Experimentation, however, pointed to this coming from the black silicone tips, not from the earphones themselves. Upon switching to the provided grey tips the sound improved markedly for me.
Therefor all my observations are made using the grey silicon tips, and not the black ones.
I have been using these IEMs for roughly 2-3 weeks.
 
 
A Starting point; This is what I like and what colors my review.
My Westone 4R with ACS silicone sleeves is my favorite in-ear-monitor. (IEM) I like ‘lush’ mids and impactful bass (which is what my JH16 is for), instrument separation is more important to me than soundstage, and I like musical headphones a smidgen more than analytical headphones. I use a Byderdynamic T1 for Classical, Techno and Jazz, but I like my Audezee LCD2 for most other genres. I like impactful bass…
 
 
REVIEW - TLDR version;
Good – The DN-19 is good with the dampers out for messy bass, fun mids, decent soundstage with genres such as pop, rock, or anything you want to sound musical rather than analytical. With the dampers in it sounds good with classical or other more “refined” music. If you drink wine after dinner and like to nibble on chocolates while listening to Tchaikovsky then you will enjoy the DN-19 with the dampers in. Build quality and accessories are top notch.
Bad – It tries too hard to be both a bass-head IEM and a refined analytical IEM. While it does both decently through the damper system, I’d really like to see what DUNU can do with this driver if they focused on one concept or the other. The design could use some revision as it may hurt certain shapes of ears. (It bothered mine a bit.)
Conclusion – A solid buy, especially if you swing between LL Cool J and Pyotr. With a bit of fiddling, this IEM can be used to listen to both in the manor to which they should be heard.
 
 
 
 
VALUE: (5/5)
The DN-19 comes with so many accessories that you will probably end up using some of them with other IEM that short-changed you in that department. The DN-19 arrives fitted with two black medium tips (which I didn’t care for) an additional set of S/M/L black buds and a set of S/M/L grey tips. They include a microfiber cloth, an airline adaptor, a whole bunch of “dampeners” (more on that in the sound section), an extra pair of ear-fasteners (a soft rubber piece that affixes to the cable to help it naturally sit over your ear) a well-made faux leather pouch to carry your earphones, as well as a very nice metal case with a rubber seal in case you are worried about your earphone getting crushed. The wire even has a rubber snap-strap over the cable to help you coil your wire when you are going to store it. No other earphone I’ve unboxed has had so many accessories. Have I mentioned that the extra tips and what-have-you come in their own carrying case?
 

Build Quality (5/5)
Build quality for a headphone at this price is great. While I haven’t put it through ‘the wringer’ or protracted use, all the little touches are there. The proprietary Dunu 3.5 plug looks strong and well built, the part where the wire meets the earphone housing is covered with an extra layer of protective rubber, the plastic is a firm sort, and does not feel cheap. (Unlike the Westone W4R.) The use of silver in the wire is commendable, and I find it quite nice as I believe it contributes to the sound of the IEM. The wire feels solid (it is coated in some sort of slick plastic that helps cut down on microphonics) and bends easily, though it unfortunately remembers where it was originally coiled. Despite this, the build quality is so high for this price that I am giving it a five out of five.

 
AUDIO QUALITY:
Sound (7.6/10) – Even all my early notes before burn-in comment on the precision and detail of this IEM for this price range. The clarity and sound separation is nice. It also has a more ‘full’ sound to my ears than a single balanced armature IEM.
 
Overall, this is a good IEM and I enjoyed listening to it. However, it was made to be user customizable through the use of different silicone tips and a “damper.” The damper is a small piece of plastic that fits in a protrusion on the side. This protrusion is a vent that lets air into the IEM and changes the sound signature. Without the damper the unit loses some of its clarity, as the bass becomes warm but also muddy and fuzzy. With the damper the unit regains its clarity but the mid-highs and top end feels a bit more sharp and defined, yet I also feel like it loses some of its resolution and fullness. The best description I can think of is that it sounds “tin-like.” At the same time the bass tightens up and becomes refined, but at the price of losing much of its impact.

Honestly, I would have appreciated this headphone more if it did not have these options but was somewhere in between the two options of with and without dampers. A cross between the warm yet fuzzy sound without dampers and the very detailed analytical/tin-like sound with dampers would be more to my tastes than the two opposites you have to choose from. While I liked the instrument separation and detail of the DN-19 with the dampers in, overall I preferred the more musical sound without the dampers.
 
NOTE ON VOLUME: This IEM doesn’t really sound good until you turn up the sound substantially. How substantial that is depends on the power of your source. With classical music on my Galaxy SIII, I have the volume comfortably at 75% in a low-noise environment. For Rock and Pop it sits at 50%. With the dampers in there is virtually no sound leakage to those around you, with the dampers out there is a little sound leakage but it’s minimal. For the Nano (4^th gen) the volume has to be at around 75% to bring out the layers of music. (dampers in)
 
Highs – I feel like this is the weak point of the IEM.
(without dampers): Without dampers, this IEM turns into a bass-head IEM. As you can imagine this muddies things up a bit.
(with dampers): I feel like they get lost in the mids as the mids are a bit more forward with the dampers in. The highs sound a bit recessed. They are present, but not as crisp or defined, and I feel like they simply disappear or loose a lot of resolution at higher frequencies.
 
Mids – The DN-19 sounds good with mids whether you have the dampers in or not.
(without dampers): Full, musical, forward, fun, exciting… in short, not very analytical, but enjoyable. This is in part because the lower mid and mid/upper bass seems to roll together to make for a good musical sounding presentation.
(with dampers): Clear, crisp, refined. More analytical than musical. It’s full, but not lush. It is an accurate portrayal of what is happening, but it is not engaging. This is the sort of thing that I look for with classical music.
 
Bass – This is where the difference between with and without dampers is most manifest.
(without dampers): Warm, messy, impactful, but the lower end of the bass seems to get lost in the beautiful warm fuzziness that is the mid-bass region.
(with dampers): Tight, refined, clear. Good representation, but no impact. There are hints of lower end bass but it doesn’t really have that oomph I want to have in a rock/pop/rap song.
 
Soundstage – It sounds like you’re sitting back about 5-10 rows form a performance. There is decent instrument separation, but it doesn’t sound like you’re in the middle of the stage. You might like this or not.
(without dampers): I feel like the soundstage opens up a bit without dampers. Maybe 2-5 rows back from the stage.
(with dampers): The soundstage is good with the dampers in, but it feels like you’re 10 rows back or so.
 
 
COMFORT: (4/5)
Outside certain issues with the sound, the biggest gripe I have with the DN-19 regards the placement of where they chose to put the “dampers.” For many ears, I assume that this little protrusion fits comfortably near the space at the bottom of the ear. For me, however, it pokes at my ear a bit, causing some irritation. I also had some issues with the tips provided, but the former is the main issue for me. They are quite a bit more comfortable than Sennheisers IE7, but less foam (Westone/Shure) tips. Sometimes it would take some wriggling to get a good seal. Silicone tips are generally not what I like to use, as foam is much more comfortable for me, as are silicone sleeves.
Mind you, I would give the Sennheiser IE7 a 1 for comfort. At least theses don't fall out of my ear or actively hurt them!
 
 
ISOLATION/MICROPHONICS:
Isolation (3/5) – For a non-foam tip, it is as expected. It cuts back around 30-40% of ambient noise with the sound off. When the sound is on, it fairly quickly replaces ambient noise. (On my Galaxy SIII, I hear only music starting at about 25% volume in my quiet office.) This is for the grey tips. Whether it was due to being unable to get a good seal, or simply due to the material, the black tips did not isolate very well for me at all. They are about what you expect from a silicone tip.
 
Microphonics (4/5) – Minimal, unless you are wearing rough clothing. I didn’t notice much in the way of microphonics until I put the cable over my rough-cloth winter parka. At this point I could hear the cable bounce/rub against the cloth. Most t-shirts and sweatshirts did not produce much in way of microphonics. If you are moving around a lot of doing a workout to Jane Fonda with the wire over your cloths you will hear some noise. In short: Rubbing is not an issue with the smooth cable, but if the cable bounces around a lot you may hear some small noise due to the coating on the cable.
 

OVERALL:
A solid buy. If you like lots of genres and want an amazing set of quality accessories to use with your future (or current) IEMs the DN-19 is certainly worth picking up. While I enjoy the DN-19 more with the dampers out, it is good enough with the dampers in to enjoy just about any genre of music.
 
 
 
DN-19 VS…
Currently I don’t have many earphones in a similar range to A/B the DN-19 against. With what I have on hand, here are my impressions.
 
Shure 535 (Compared to the DN-19 WITH dampers): The Shure has better instrument separation, better definition impact-wise. The Shure feels more balanced. However the Shure feels like it has a bit less definition and sparkle, and compared to the DN-19 the individual sounds feel like they mix a bit more when there are a lot of instruments or vocals in the song.
(Compared to the DN-19 WITHOUT dampers): Without dampers the DN-19 has more impact in the bass section, with the bass sounding more warm, but also a lot less defined. The highs of the DN-19 loose that ‘tin-like’ sound and sound more full, but also less separated or defined, letting the Shure slip ahead in the detail and soundstage department.
 
Westone 4R (Compared to the DN-19 WITH dampers): I feel like the Westone 4R is everything the DN-19 is trying to be with the dampers in. The Westone 4 has a good soundstage, slightly warm mids but a more neutral presentation, and a controlled precise presentation.
(compared to the DN-19 WITHOUT dampers): The Westone 4R feels like it’s lacking a bit of body when it comes to Pop music, the DN-19 without dampers is more engaging. As expected, there is a lot more bass as well. Vocals are good. For Pop and Rap I feel that the DN-19 is much more enjoyable than the Westone 4R due to the more musical and impactful performance of the DN-19.
 
JH16 w/t Whiplash V3 Hybrid 8 cable: Yes, this is a silly comparison. The JH16 is better. Pay $1600 more and the sound improves. Surprise! Yet with the dampers in, there is one area where the DN-19 comes close to the JH16 and that’s when it comes to listening to instrumental-only classical music. It’s not better, but sometimes it sounds closer than I would think it should for 13% of the price of a JH16/Whiplash.
 

NOTE; I am an audio appreciator, not an audiophile. The follow is my thoughts and not based on some of the crazy in-depth tests that some do. This is a layman’s review for a layman. =)
 
BACKSTORY AND DISCLAIMER;
I spent some time browsing the forums of head-fi and looking over the DAP lists before ordering this product. I almost bought a Cowon Z2 (since I’m in Korea, I can get it locally) but in the end decided that $280+ was a bit much to spend when I have an iPod/iPad for all apps and all I wanted was a pure and powerful music player. The Rocoo P seemed to be what I was looking for, and it has received good reviews here and elsewhere. I contacted Hisound and got a quote. They also told me that I could get a free pair of in-ear headphones if I wrote a review. I told them that I would, and they included a pair of headphones with my purchase. I’ll make a brief comment on those at the bottom.
 
 
OVERALL;
I’m quite happy with this player. It has its flaws and areas that could improve in, but for the money it’s a great value and what it does it does well! For pop/rock, I think it shines. It has a good feeling of spaciousness for most music, especially classical, and overall the sound is quite good for me. There does seem to be a bit of a smoothing -off in the very high end treble, and a bit of a dropping the low-end bass, but with the right in-ears, it actually makes many songs sound better. My Shure 535s sound quite nice on this player, whereas my more neutral Westone 4Rs seem to highlight some of the ‘smothing’ of the sound that the player gives.
 
 
AUDIO QUALITY;
This is probably one of the strongest points of this player. Which is good, as it bills itself as a powerful DAP that focuses on music! (To the expense of a few other things, such as the UI.) The sound is spacious and good. I did notice a bit of hissing at first, but I haven’t really noticed it since. I didn’t think that DAPS actually had anything like a ‘burn in’ time, but I left the player playing music all night, and after a few days, I swear it actually sounded better to me. Strange but true.
 
Highs: The highs are great, but there is a bit of smoothing at the top end. This can remove shrillness or dampen the high notes depending on the song or your take on what it’s doing.
Mids: Delicious. That is to say, really nice.
Bass: Good bass, decent punch, but it does seem to soften the very low end to my ears. I think IEMS that have a bit more bass emphasis get more out of this player for bass.
 
 
BATTERY LIFE;
Decent. Not great not terrible. Decent. It would be really nice to see a Rocco P with the battery life of their own Studio V.
 
 
DESIGN;
The good;
Solid! It feels really durable. It’s pretty small, all the buttons are easy to reach, and all the plug ins are in logical places. It looks a bit 60s-ish, but overall the design is good.
 
Driving ability. I tried this DAP with my Sennheiser HD650s, and it could drive them decently, though I had to up the power to almost max to do so. On most mid-range headphones, I think this player would have no trouble driving them.
 
It can read most(all?) file types. It reads everything I put on it. Including iTunes-bought mp4 files. Flacs sound great. I have not tried putting an Apple Lossless file on it yet, however.
 
The bad/nitpicking:
No hold switch. I think what I’d like more than anything else on this player is a ‘hold’ slider. Even my Creative Zen from circa 2004 had a ‘hold’ slider. One of the reasons I stoped using the Fiio E7 (and really like the Fiio E17 now that I have it) is due to the ‘hold’ slider. One of the first times I walked around with the Rocoo P, something in my pocket hit the volume button and I my ears were getting blasted.
NOTE: If you have the case for the Shure 535s or one of those line, the player fits snugly inside that. You can actually zip it close and it will act as shell to prevent accidental button presses.
 
Firmware. I also had an issue that stems (I think) from removing the Rocoo P without ‘safely removing hardware’ from windows. The folders got all mixed up, and the player insisted that there were no files on my SD card. Windows said otherwise. I had to re-install the firmware to fix the problem.
 
No auto-stopping of playback on headphone removal. When you remove your IEM/headphone, the player does not detect this and stop playing the music. If you do not notice this, your battery can be drained while you are doing other things.
 
 
USER INTERFACE;
This reminds me of my Creative Zen from 10-odd years ago. It’s really simplistic. It IS easy to navigate, but some of the things you might expect a player from 2012 to do might take a bit of work on this DAP. Making playlists for example. The UI is simple, gets the job done, but the bigger your SD card and the more music you have, the more you’ll need to plan in advance how to set things up.
 
 
VALUE;
I give it 5/5 3(1/2)/5 for the money you pay for it. It’s a great player. There are things I’d definitely like to see on this DAP in the future, and things that could use improvement. For it’s price, and for what it proposes that it will do, however, this DAP is a great price. I have yet to try it with a custom IEM, but with my Shure 535 and Westone 4Rs over the last week+, I’ve been able to get a decent feel for this player.

EDIT 2012/11/06: Value reduced to 3 1/2 stars due to problems listed bellow.
After having these for several months I have lowered the value I give this by one and half stars and overall rating by a star for the following reasons.

Button issues;
The bottom button (volume down/go down) on the player stopped working unless pressed ~extremely~ hard. It is not a real bother to quickly adjust the volume after turning it up.

Random shutoff with a loud static pop;
Occasionally the player has shut off mid-song with a loud static pop in my headphones. This is not a friendly experience. It has made me hesitate more than once when I consider using it. This issue has happened while walking, while sitting down, with movement and with no/minimal movement. It happens maybe once every few hours.

Static(?);
Sometimes I hear a funny sort of warble over my headphones while using the Rocoo P. This happens most frequently on the subway. My best guess is that the inside is unshielded and it's picking up some sort of electrical signal/static and transmitting it to the headphone. It's hard to really describe it, but it sure ain't music.

 
Note on the bonus in-ear Hisound ‘popo’ headphones;
They are the first ‘bass-head’ IEM I’ve ever heard. I really liked them, but I already have some high-end IEMs, and my Korean co-worker here is a bass-head so I gave them to him. When he tried them he said “They tremble my head.” (Hahaha…) He agreed that the treble is clear the bass is impactful. IMO, it makes a great combination with the Rocoo P for rock/pop. I actually found myself looking for a pair when I was at a local store, in the hopes that I could snag another pair to play with. They are pretty IEMS to boot. (With the slight detraction of the bright red cord.)

DISCLAIMER: I am not an audiophile. I am an audio appreciator. I hope.
I had these for one year before the sound seemed to "drop" in volume/quality on the right side. However, I had been frustrated with them for quite awhile before then due to their shortcomings in design.
 
VALUE:
I give this an overall positive value simply because the sound on these is really quite good.
 
AUDIO QUALITY:
High - Clean
Mid - Full, rich, good body, well produced
Bass - Good. Not booming, but good. Not messy, but it lacks a bit of 'presence' to give it oomph.
Actually, it was these IEMS that got me started on really appreciating music on a whole new level. They brought things out of the song that I'd never heard before. At one point I thought something was distortion only to realize it was the creaking of the chair as the artist played the harp in the recording!
 
DESIGN & COMFORT;
I'm putting these together, as it's the poor design for the IEM that kills the comfort! They are awkward to get in,and (for me) can fall out rather with very little effort/exertion. The cord is put behind your ear with little pieces of plastic that can easily slide up or down the cord, requiring you to readjust it every time you put them on. The design of the housing did not suit my ear at all, and it always felt really awkward when I put it in.
 
ISOLATION:
The isolation was almost non-existant. Pretty much everything bleeds through. Probably in part because it sits right on the top of your ear canal and doesn't go into that far. There was some sound isolation, it's better than an earbud that doesn't go into your ear, but not by very much. A crowded space will go right through any isolation the IE7 is trying to provide.
 
OVERALL:
If it fits your ear, great. If not, it'll mean a LOT of fiddling for you.The sound is great, the design is terrible. Get another brands IEMs and try some of Sennheisers over-the-ear headphones. They're way better.
(May I recommend the HD650?)

DISCLAIMER: I am not an audiophile. I am an audio appreciator. I hope.
 
VALUE:
Overall I'd say that the value for these IEMs is pretty good, given how it sounds and what it does.
 
AUDIO QUALITY:
Highs - The highs for this is clear, crisp, and it sounds really good. It's not distorted at all no matter how much is going on, and the separation between the highs and mids is clean.
Mids - The mids are full and neutral. Its detailed without being flat, but there doesn't seem to be much coloration to it either.
Bass - It's there, but it's not in your face. If you are wanting "boom boom" or like to 'feel it' then these will be lacking in the bass department for you. That's not to say that the bass is missing, it's just not as present as in other IEMs. (Such as the Shure 535s.)
Soundstage - The soundstage sounds better than any other IEM I've heard. The soundstage for this sounds like a cross between the soundstage on the Sennheiser HD650 and the Byerdynamic T1. That is to say, it makes orchestral music sound great and reduces the feeling that you're just listening to noise, everything is clearly separated.
 
DESIGN:
The IEM is light and easy to put in. It feels like the IEMs aren't even in my ear. The cord looks like cheep plastic, but its also very light and doesn't get in the way when you wear it. (I've not had any issues with the cord, its sturdy enough... just shiny plasticy black.)
 
COMFORT:
I actually like the foam tips on these. They're more comfortable to me than Shures Olives. (Shures foam tips.) These are the second most comfortable IEMs I've worn... the first being Bose IE2. (So easy to put in!/wear!) They're light, comfortable, and sound great! The cord isn't that long, but it's the perfect length for DAP use.
 
ISOLATION:
It's "ok." but it doesn't block things out as much as I would think/like from an IEM that goes that far into your ear canal. It's not a big issue unless you want to use them in the subway or a noisy area.
 
OVERALL:
The sound quality coupled with the comfort of wearing the Westone 4Rs is hard to beat. The biggest drawback is if you are looking for more "oomph" to your bass, with the second lesser drawback being the sound isolation. (Though you can always put Shure Olives onto these... its a bit of a mash-on, but they do fit. At least for me.)
 
 
If you want more omph to your bass and are willing to give up a -little- bit on high/mid/soundstage, think about the Shure 535s.

DISCLAIMER: I am an audio appreciator, not an Audiophile. I hope.
 
IEM BACKSTORY:
I owned a pair of Shure 215s for a few days before I picked these up. My initial reaction to the 215s was disapointment. They provided great isolation, but the sound seemed flat to me. I purchased the Shure 215s to replace Sennheisers IE7. (Which is why they felt "flat" to me I think!) Currently I alternate from the 535s and Westone 4Rs.
 
VALUE:
I bought these in Korea, so I paid too much for them. That said, I'd say a good price point for them would be 350-400ish. That might be because I don't like to spend money. Value-wise, they feel really well made and the sound is good. The cord itself might outlast some DAPs!
 
AUDIO QUALITY:
Highs & Mids - (to me) sound good! Some things sound better to me out of the Shure 535 than my Sennheiser HD650. (Out of a Fiio E9 at least.)
Bass - This is what I like the 535s for. The bass actually feels like it makes an impact. Its clear and it's punctuated well.
Soundstage - Westone 4Rs beat out the 535s I think. That's not to say anything feels 'cramped' on these. Things sound good, its just not as spacious or spread out to me as the Westone 4 makes things sound.
 
DESIGN:
Initially I had issues with this IEM hurting my ears if I wore them longer than an hour. The casing was big (perhaps my ears are small) so when the IEM rested against the bottom of my ear it would actually press down on it and cause my ear to hurt. Eventually I put an extreme kink in the cable at the base of the housing and it became comfortable to wear.
Cable - This is both good and bad. It's nice, long, and is very very sturdy. At the same time, if you're having to move it away, it can be a hassle. If it's lying against your neck, you'll definitely feel it.
Driveability - Anything can use this. It sounds better with a bit of an amp however. (Or so it seems to me.)
 
ISOLATION:
"Wow." Isolation-wise, this IEM has the best isolation of an IEM that I've tried. Those Shure Olives are pretty amazing at what they do.
 
OVERALL:
It'd say it's a great buy, especially if you can get it for $400-$450. If you are looking for something that is;
durable, noise-isolating, good with bass...Then this is an IEM to consider.
 
 
If you'd like something with a wider soundstage and a bit more emphasis on highs with a bit less isolation/punchy bass, then look up the Westone 4Rs.