COWON J3 32 GB Portable Media Player (Black) - Reviews
Pros: everything is great from this player
Cons: the only issue, is the recharging cable..
IMO, the Cowon J3 is the company's best device/price. It offers an excellent sound and compatibility with almost any file you want to play on it. It's also capable of driving all but the most obscure headphones to satisfying levels of loudness, and relatively excellent battery life. However if you're just looking for a device that does one thing -- play music really and extremely well -- then the Cowon J3 is an excellent option.
But its not as good as the Plenue D IMHO :)
Pros: Very clean sound. Beautiful and abundant custom themes and UIs. The player's design
Cons: Thin, cold and lifeless sound. Bass is shallow , sibilant mids. EQ makes sound even worse than the default (mainly squeeze the mid-range)
I used the J3 with vsonic gr07, sony ex1000 and don't think it is a very good sounding PMP.
Pros: battery life, great screen, physical buttons,fast interface,lot's of sound settings
Cons: sound quality at default settings
I owned a J3 32GB player for 2 or three years, so I got to know all it's advantages and disadvantages.
The good
This thing has much more output power than most non-audiophile players around. I never maxed it out, and the sound remained controlled at most volume levels. The battery life is simply outstanding, about 50 hours with that magnificent OLED screen. Also, the video playback and SWF's played smoothly. There are a lot of audio-enhancements, millions of sound settings combinations to choose. 
The bad
The sound at default settings (without using equalizer and the various enhancements) is pretty much dead, lifeless with undefined bass, and highs not very defined. It improves a lot after proper equalizing, but at the end you end up with non-realistic sound that you can like, but feels too plastic. It's a shame, because is a ~30$ Clip can sound good, no reason for premium product to fail in such a basic thing as play unequalized music.
Bottom line
I would consider it only if fantastic battery life is needed. For any other purpose there are other players that cost less and deliver more.
jon parker
jon parker
Ive also had this player for a few years now and agree with your points. The default sound is indeed quite dead sounding although for some critical listening with sensative earphones this can on occasion be useful.
I do have a bit of a hate /love relationship with them. With the BBE enhancement ON the sound can be dramatically improved. Sometimes even sounding like a good DAP can sound and this is where the love/hate comes. I strive for the best possible sound by using the 'best' DAC chips married with Opamp & quality iems. So even though the J3 can sound very good . . . it gets that sound by 'cheating'
Anyway, with it s huge battery life it is great for burning in Headphones & is perfect for taking travelling when you dont want to take your best gear with you.
One thing you didnt mention is how good the J3 is for reading from! If you have reasonable eyesight you can put a load of books on it in txt format and read from it although the screen light is the biggest battery drainer! 
As a travel companion this player gets 10/10
For sound quality it gets 10/10 for its BBE & MP technology but maybe 2/10 for the chip's bare sound :)
Pros: Sound quality, expandable storage, zero hissing, BBE, battery life
Cons: Proprietary cable, difficult to create playlist, still pricey online after many years.
For most people, Cowon J3 is pretty much the ultimate 'non-audiophile' music player for its sound quality, battery life, and expandable storage (I've heard of 64gb micro sd cards working on it, I haven't tried myself yet).
After having many Creative hard disk based DAPs(Jukebox, Zen touch, Zen Vision W), I wanted to migrate to flash based ones. As Creative simply became totally uncompetitive with audio players, I had to look elsewhere, by chance I stumbled upon Cowon, and I found J3 to be the perfect choice.
The sound is clean, clear, absolutely no hissing even with some very sensitive IEMs, and with BBE enhancement it becomes pure enjoyment for the ears. It also has an equalizer for more fine tunings.
The battery lasts long time, with regular commuting use, you probably will need to charge it every 2 weeks or so with sound enhancements on, more if every bells and whistles turned off.
Now the bad things, the cable is proprietary, I really don't know what Cowon was thinking while designing it, so if you lose it, you will need to order another one online. Good thing the battery will last long enough before your shipment arrives.
The UI is horrid for today's standards, Cowon seemed to have trouble designing one, it is very tedious to make a playlist work.
The prices are simply ridiculous for an aging DAP, and currently many online sellers bundle them with useless 8GB sd card to inflate the price further. Very deplorable.
Bottom line, perfect standalone player for commuting, gym etc, without the need of an amp.
On the for sale part of Head-fi you can see these go for $140. I got it $125 myself refurbished 3 months ago. 
Loras 461
Loras 461
Very nice  review .
Pros: Great sound, EQ features and options, portable, battery
Cons: reliability, not the best UI
Well, i won't make a long review.
Having the iPod Nano V6, SansaClip+, SansaClip Fuse, iAudio 6 and a mix of older Sony's, iPod's etc ... I think the best sounding player to me was the iAudio 6. Followed by the iAudio J3. The difference is marginally, but somehow the 6 just performed a tiny bit better to my taste. The BBE+ etc effects just had a smoother and warming impact, where on the J3 it starts to sound a tad more cool, in some cases even mechanical (hissing etc), where the 6 kept composed. 
But ... sadly, i only managed to enjoy the J3 for a few months when it died. The screen showed weird colors, like there was some graphic card issue and froze, it didn't respond to any button actions. Resetting, rebooting ... nothing. So i returned it, got a new one, after a few months ... the same happened. 
So i've given up on this model. Might try some other iAudio devicse, but i have no confidence anymore in the J3. 
Odd indeed.
As I've said I've had no problems with mine.
Where did you get a new j3?
They've been discontinued for some time now.
Ah, the experience is a bit older ... Must have been over a year ago. In the meanwhile i've had more players and while i was checking this list and was kind of surprised to see this one on no. 1. I think it doesn't deserve it, so i shared my experience. I think even the Sansa is just as good (better out of the box), but the BBE + JetEffect options is a big USP of iAudio, so that's why i prefered the iAudio slightly. More flexibility. Pricewice it's a no brainer though, sansa all the way. 
+1 @perhapss
Mine never crashed ever. It's still the golden standard for me. 
Pros: Extreme Battery Life, BBE & Jet Audio Effects, EQ, Lightweight, Superior Audio Quality, Supports Most Formats
Cons: Screen resolution, Navigation has a learning curve
The short and simple of it is this is the best DAP for the price I have owned. I have used all the main stream players, (IPods, Zune, Creative Zen Player, etc) and I will never go back. Besides the great audio quality, the battery life is unparalleled. I have played with my friends iBasso and Colorfly and although they might be a bit better (maybe) with the full lossless, i still like the full freedom of the Jet Effects. Besides, it was much cheaper than what they paid.
If I had to change one thing, it would be the screen, its touch interface works most of the time, but with cold or dry hands sometimes it needs a second tap. Of course the tactile buttons make up for it.
For reference, I own the following headphones for comparisons.
Bose IE2, Bose QC20, Ultimate Ear UE6000, Sennheiser HD590, Sennheiser OCX 880, Denon C751
Good NOT great player. Audio is ok but since has been surpassed by a number of better players (Cowon Z2, Sony Z and F series walkmans, Samsung 4.2 Galaxy etc.). Interface can be a dog and the touchscreen interface looks extremely dated now. Battery life is very good but again not class leading. Build quality is ok but it does feel a bit cheap.
This once was head and shoulders above the rest but as with all things gadgety, it has had its day.
  • Like
Reactions: xylin6
Point being you're way too critical. Besides for the fact that the Samsung Galaxy does NOT have better audio than the J3, and every other option you mentioned is over twice the price of a J3 you can get in the "for sale" part of head-fi forums (for about $140 or so),
Not to mention it's much smaller than the X5 (which has 1/6 the J3's battery) and literally half the weight, it's still a better package than anything else I've seen for this price.
Yes, better than the crappy Samsung, the bulky X5, the Z2 is much worse overall than the J3 (just google it), and the Sony Z series is 3x the price.
Your audio expectations are as wacked as your hair. Both seemed to have gotten electrocuted.
lol, your audio comparisons (Cowon Z2, Sony walkman and even Samsung Galaxy better audio quality ????), seen from 2017, are... curious.
I really wonder what headphones/IEM you used on those devices... was it stock earbuds ?
Congrats, your notation contributed to a really low result for a great player that I still use in those days of (price inflated/power hungry/great sounding) HD players.
Thanks for the put down. Glad to see people can respect each others opinions on head-fi.
Pros: Battery Life, sound quality, audio formats, simple to use
Cons: Does not support many videos formats, blue-tooth not that good.
My best Pmp so far.
I have tried sony's, sans'a, and cowon j3 is the best so far.
Unfortunately I lost it, and now it is discontinued so I have been trying to replace it, I bought a Sony Walkman A 865 which was sent back due to the poor battery and poor Eq, after that I bought a Cowon Z2 basically the same sound quality than J3 but an horrible android device, this also was sent back.  
So now I will just wait for a "successor" of the J3, since any Smartphone nowadays is able to perform better than cowon Z2, there is no point in getting a low quality android product, J3 has basically what is just needed today, a great battery life, many audio formats support, nice amoled screen; If more video support can be added and a bit bigger screen and improve the bluetooh performance in order to send and receive files, then I will get a new cowon.  Otherwise I will just use my Smartphone which plays reasonable well with Poweramp on it.
Fairly new to mp3 players, tried the Ipod Nano 6th Gen. Never would shuffle worth a damn.
Same 150 songs over and over. Researched this J3 here and purchased it. Followed ALL instructions as to installing the newest `firmware' using my Mac. Wrote a polite letter to those people in the country it was made. Too old for this nonsense. When the songs change the volume blasts louder, plugged in the Pico amp, sounds better, BUT CANNOT install firmware.
Much nicer then the Ipod but has different items to learn, right?  Please help this  feeble old guy 
with the  updated firmware.OK?
Update:     5-6-2012
Now a week later, it does, if your careful work with a Mac, all the comments and data above is 
right on the money, this is heads and shoulders ahead of the IPod. You can by a simple `click'
turn any song into a `live' recording with reverb large rooms or small, the settings are almost unlimited. And playlists are IMHO gone, I found a very simple way to place your mp3 or better
into the J3 with making the `lists'. I did have to use an older pc to install the 2.29 firmware.
Then back to the Mac for all other projects. Caveat: Install `BlueHarvest' in your Mac first___
otherwise the J3 very well might `brick'. Before using with a Mac clean ALL caches & cookies.
I use OnyX to Clean the Mac, it is free. This J3 will make your listening so much more enjoyable. After the  first few recharges it will play music for over 2 days non-stop.
Since finding this and reading all reviews here, I have yet to turn on my large system, "totally-tubes" the only way to fly, analog. FYI: When attempting to understand, it think Asian and go from there because Cowon will NOT answer your questions. Cheers!
Sooo how is the sound quality ?
Pros: Effective EQ, BBE, Gapless playback, Lengthy battery life, Lightweight, Accessible physical buttons, Easy to drag-and-drop files.
Cons: Weird UI, Custom UIs are slow, Can't use while charging, Video format support lacking, Battery life meter is useless, Korean proprietary plug.

Cowon J3 -- JoonBug's Review with pics!

Official Cowon J3 JetAudio Product Page


Let's face it, at the time of writing, the iPod has taken over the DAP (Digital Audio Player) market. Wherever one goes, one is bound to see someone with either an iPhone, iPod touch, iPod nano, iPod classic, or iPod shuffle. The characteristic white Apple earbud is more a fashion symbol than a way to be in touch with our music. The iPod itself is also not that great of a music player either, sporting nice audio circuitry but messed up software, making it very difficult for people to enjoy their music. Some don't care for this lack of audio fidelity, and you see them wearing the popular Beats cans. Those who do sport dangerous looking "portable" rigs with small DACs and amps, while others skirt the iPod line altogether for a lesser known DAP, like this Cowon J3.
My trek to this product was not entirely unusual. I had already had an iPod touch (3rd gen) with an ESW10 with 256kbps music and I was happy. But then my iPod became dependent on an AC connection because of its flagging battery. I had already found head-fi by then, and saw the J3 was enthusiastically recommended as a great DAP with phenomenal sound quality So... let's find out if the J3 deserves the hype!
View attachment

Before we get started...

  1. My comments about the J3 stem from my experience with an iPod touch (3rd gen).
  2. I like a very neutral sound signature.
  3. My favorite genres of music are classical, acoustic rock, and jazz in that order.
  4. I purchased my J3 with a DMB tuner, only users in Korea, and possibly China would care about this. For obvious reasons, having the DMB tuner makes the J3 more expensive.
  5. I got the White 32GB DMB one from a Korean vendor while I was in Korea.
  6. I also want to apologize for the crummy picture quality. I need a new camera.

Cowon J3 Specs (from the Cowon page)

(L x W x D) and Weight​
106.5mm x 56mm x 9.9mm​
Color Options​
Chic Black and Sleek White​
Size Options​
Screen Specs​
3.3" AMOLED (490x 272  screen ratio - 16:9)​
64hr Music, 11hr Video, 3.5hr USB charge​
Headphone Jack Output​
L/R each 29mW (w/ a 16 ohm earphone)​
Frequency Output​
20 ~ 20,000Hz​
Power/Hold (left), Next/Prev Track (right), Play/Pause (right), Volume (right)​
MicroSD slot (up to 32GB), 20 pin USB proprietary jack​
Supported Audio Codecs ​
MP3, WMA, OGG, FLAC, APE, WAV (also unofficially AAC)​
Supported Video Formats​
AVI, WMV, ASF (also some early H.264 vids)​
*  = Some countries have specific size/color options i.e. 4GB only comes in White, etc.
** = Button placement is when the screen is facing towards you.
More specific J3 info can be found at JetAudio's J3 Tech Spec Page


The J3 comes in a minimalistic, self-contained plastic small flower-pot shaped apparatus.
View attachment


Open it up, and it becomes...
View attachment
Pretty, huh? Unfortunately the outer covering on my J3 packaging was cracked. I'll blame the postal service on that...
Opening up the brown paper cone-thing leads to a user manual, earphones, proprietary USB cable, and a proprietary 24 to 20 pin plug. The plug is absolutely useless if one is outside of Korea, as it's a standard in Korea but rarely seen and used elsewhere. The user manual does a so-so job of explaining the controls inside, but it suffices. The earphones are decent, better than the stock iPod earphones, but one will need a better headphone to enjoy the J3 fully.
View attachment
Overall, a pretty spartan collection. Points for a clean packaging look.
My rating = Good

Design & User Interface (UI)


On the outside...

View attachment
Having won the Red Dot Design award in 2010, the J3 is aggressively marketed by Cowon and JetAudio for its fetching looks. My J3 came in white, and I was very pleased with that color. The white was innocuous enough to avoid screaming "LOOK AT ME!" but also stood out with that bright sheen. Those who like their color palette on the more inconspicuous side would like the black. There is a fairly solid-feeling screen with a metal plate obtruding the bottom part. I didn't really like the extra space on the bottom: it made the 3.3" screen look smaller. But then again, the space is convenient for holding up the device. On the right (with screen facing towards you) there is a Next/Prev track rocker, below that a Play/Pause button, and way below that a volume rocker. Being used to the iPod, I would have appreciated the volume rocker at the top, but it works.
On the other side of the device is a power/hold button. I actually have broken my power button and would like to warn prospective J3 owners from pressing it too hard. This thing is not as indestructible as my Touch's power/hold button. Finally, on the bottom is a headphone jack and a cover, when uncovered, reveals a microSD port and a proprietary USB port. I like the cover as it keeps dust out of the ports, but it is inconvenient to access the ports. If you grow your nails a little, it shouldn't be a problem. All, in all, not bad, Cowon!
My rating = Great.

On the UI side...

View attachment
On the software side, the J3 has three main modes of interaction. First, there is a "block" mode where every function appears as a square block, much like an iOS interface. There is no option to add icons or widgets, and blocks can be moved around by holding on to a certain block and dragging it when red markings appear around it. Secondly, there is a "list" view where said functions appear on a list, much like that of a Zune. As far as I am aware, the list order cannot be changed. Lastly, there is a widget mode where one can pick and choose "blocks" and functional widgets to add on multiple screens. The experience is quite similar to that of an Android interface. Interesting what Cowon is trying to do... choose the mobile OS flavor you like, I guess?
Usability wise, the first interface is my favorite as it is the least hassle to deal with. Functions load quickly, and the feel is snappy. The second interface is cool to play around, and has that schnazzy sort of feel until I got annoyed of scrolling down all the time to change my EQ settings. The third UI is technically my favorite and provides fun little widgets that greatly improve the user experience. However, there's also plenty to dislike about this interface... ie 70% of the times I've crashed my J3, it's come from this interface. More onto that later.
There is the route of a custom interface. The community at is fairly active about all things Cowon, and one can receive help installing interfaces. I'd personally like to recommend Kizune's UIs which are, I believe, the more popular of those who choose a custom UI. Having said that, I recommend sticking with the stock UI as it's the fastest UI for a J3. Period. Being used to an iPod touch's snappiness in switching from apps, the load and response times for custom interfaces were unbearably slow.
Long story made short, the use the "block"/iOS interface. Cross your fingers that you don't crash the device.. like I did so many times. Custom UIs are great if you can wait for every touch and button click to register. The UI does the job, just barely.
My rating = Pass/OK

Next up: Music/SQ
Thanks to work and school, there's no time to work on this review, but rest assured, this review will be completed by Christmas-time.
  • Like
Reactions: miceblue
if you enjoy neutral sound...I recommend that you try the S9 if you havent already...
to me S9 sounded even more neutral...
Hey, thanks for the tip. I happened to try both out before I bought them, and I actually preferred the J3 b/c of a slightly cleaner sound and more features than the S9.
The battery of my J3 had been damaged , I'm thinking of changing one . Do you guys know the size of the battery ? Thanks a lot .
Pros: Amazing sound quality, great range of file support, gorgeous look, clever interface, regular firmware updates, no software (e.g. iTunes) required
Cons: Small harddrive space
After my Creative Vision: M (60gb) broke in the Fall of 2010, I was considering getting an iPod to replace it. Thankfully, my brother directed me to this.
Upon receiving the item, I was immediately overcome by how gorgeous the J3 is. It has a small, slender, sleek black build; it feels comfortable holding it in my hand. Then, when one turns on the device, we're greeted with a rather quirky interface. From the bubbly sound when you press a button on the screen (which can be turned on and off), to the various icons which take some tinkering with to fully comprehend, the Cowon interface is admittedly quite strange compared to both Creative and Apple products (but incredibly flexible once you understand how it works). There are 3 menu styles, the default square grid, a grid list, and a sort of 'desktop' in which you can drag around all of the icons and arrange them in any way you like. It would be too long-winded to go into detail about the menus and all three interface styles, but suffice to say, they take some playing around with to get a feel for. If you made it this far on the internet, the learning curve should be no problem.
As for the rest of the pros, they speak for themselves. The J3 can play all the file types as described -  whatever I threw at it, it played with great clarity. The sound is fantastic, even more so with high-grade equipment. The equalizer and sound settings can give you many different feels in order to get the sound you desire, and the volume on it can go quite a ways. At a volume of 20 (the maximum is 40), it already quite loud, more so than at the half volume setting for an iPod or Creative. In fact, using Shure SE530 earphones, listening to music at this volume for more than 30 minutes started hurting my ears. I also tried the J3 with my Sennheiser HD595s at the same volume with excellent results (no amplification, will update this review when I get a suitable amp); the sound is quite neutral, with crisp mids/highs, exactly how I like it. The battery life at a sustained volume of 20 can easily last you an entire day, though I haven't done extensive testing with the battery life to say much more (e.g. how long it can play movies before dying out).
In addition, browsing through the files on the J3 is similar to browsing through the files on your computer's hard drive; one can simply copy and paste files from a computer straight to the J3 with no software requirements, make new folders and rearrange them as you see fit, etc. This makes it very easy to work with. The regular firmware updates are just icing on the cake; many, if not most of the bugs that the J3 had on release have been remedied as of the writing of this review (including the dreaded playlist bug).
Admittedly, if you've amassed a great music/video/picture collection, with most of your collection in a high grade file format, 32 gigabytes of hard disk space may not cut it. This is rather unfortunate since one of the main appeals of the J3 is its ability to play high-quality audio files such as flac; a trait that can't be fully flaunted with such measly disk space. Even at the time of its release, the J3's competitors were easily boasting +60gb hard disks. If not for the first two pros I listed, this would be an inexcusable shortcoming.
As a final note, the J3 can't connect to the internet and isn't a phone. I mention this because these are two popular features to have with todays culture. Fortunately for me, I care for neither of them.
What about these set ?

Cowon J3 and Sennheiser HD 598
Great review! makes me sad they don't make these anymore as i would love to own one.
I have a Sony F807 for now which is a fantastic player,still, for all the great things I've read about the J3 I hope to find one someday,I agree that dap's should focus on sound quality first and leave the extra stuff (phone/camera/internet etc) to separate devices.I know some people like to have an all in one device but it seems to me that those types of devices just don't have the great sound of a dedicated dap/pmp plus the last thing I want to hear when enjoying my music is a ringtone blasting in my ear.haha.
Loras 461
Loras 461
Yes the battery is amazing . Never measured but mine has got to be over 40 hours plus.
Pros: GREAD SOUND!!!, easy interface, not apple, almost ALL music format support, customizeabal, small, lightweight, GREAT screen touch and visual wise.
Cons: A little too flimsy feeling, The interface takes getting used to coming from an Itouch.
COWON J3 16GIG V.S. I TOUGH 2nd gen 8GIG*for sale and jail breakable*
Well where to begin.... I got this to replace my Itouch*that it for sale* due to the fact that the headphone jack is broken an easy fix I have guides for but I was looking for any excuse to get rid of the thing. I like the features the Itouch offers. I must say it is a great little handheld micro tablet*so to speak* but the output is just baaaaaad. The Cowon J3 puts it to shame in terms of audio out put. Running the Ipod at max volume is about running the J3 at 28*caps at 40*.
Build: Well I must say the cowon is light, like it feels like nothing is on my hand, the Itouch is a heavy best I suspect from the glass screen which IMO is just a poor design choice. The J3 feels solid just very very VERY light, I cannot stress how light it feels. Nothing creeks, nothing seems to flex, and further more no corners to get bend like the Ipod.
Screen: Well the Itouch screen is nice, the J3's screen is VEEEEEEEEERY nice. Clear, and color full*accurate*. The touch is more sensitive than the Itouch which I like as I hate having to struggle with hitting the pause button on the Itouch, this bring up another good point. BUTTONS!!!! for pause/play, and next song, last song WOO BUTTON MASTER RACE*it's really a big deal to me, I have touch only things*
Sound: Well the J3 gets A LOT of praise on here and I see why. It sound like I have just crawled out of a cannion of apple crap campaigning adds and hit the bright vivid horizon of understated but power full MP3 players.
The reason I bought this soo cheep is because I found it refurbished by Cowon USA, it's brand new, not a mark on it, nothing It's as good as new, nothings off about it, all plug ins work correctly nothing.
I really love this, the output leaves a tiny bit of a hole just in the over all volume but boy oh boy does it get my K500's moving*the Itouch can barley power them to an audible level*
Over all I am very happy with this, I hear you can put emulators on it aswell wich would be very very cool as well. WOO FLASH!!!!AHHHHHAHHHH!
So would you know where I could get the same deal you got? I may be interested in picking this up to replace my fuze. My Sflo2 was sent back due to factory defects so I have to wait until they send me a new one ;(.
ummm e-bay? I bought from Jet Audio so look at them or Cowon USA for a referbished model. the S9 is also the same MP3 without the buttons or memory card slot.
Thanks man. I'll give it a look. The only issue though is it lacks a line out dock :frowning2:. From what I've been reading on headfi with a decent portable amp via Line out dock the fuze and iphone 4 sound better so I guess I'm just gonna stick with those combos using my Leckerton UHA 4. Thanks though.
Pros: Big capacity, very small size, long battery life, Flac & APE, microSD
Cons: none, that's all I need for audio.
The best both worlds : small and lossless optimal player.
Big capacity, very small size, long battery life, Flac & APE, microSD
Pros: Sound Quality, BBE EQ, Battery Life, Durability, Buttons, Usability, Drag&Drop, MicroSD Slot, Screen, Powerful and Clean HO (works well as a LO)
Cons: None
Background: When I lost my S9, I had to find a replacement. I began to look for options, noting the Cowon J3, Nationite S:flo2, and Hifiman HM-601 as possible options. Then I discounted the Hifiman for the sake of portability. I spent a long time deciding between the J3 and the S:flo2 and eventually went with the J3 for the battery life, usability, reliability, and the digital volume control, as I like to keep my player on volume level 1 and leave it there in order to preserve my hearing as a musician.
I just got home from a trip today and this pretty young thing was waiting for me on my desk. I loaded 30gb of FLAC and listened for an hour, then decided I had to post a review. In short, this is my new favorite mp3 player. The S9 was awesome, with a few flaws. The J3 fixes them.
The button placement is so much better. I can put the screen on lock, and put it in my pocket, not worrying about the tactile buttons being pressed on accident. This gives me control without having to fiddle around with unlocking the device. 
The MicroSDHC slot is a godsend to those with large libraries or love to discover new music. With my S9, I always wanted more space. I love to transfer new albums I haven't listened to to my player and either delete or keep them, then repeat the process. With the S9, I had to keep deleting old albums that I liked somewhat in order to keep listening to new music. I have this card ( coming in the mail and I look forward to having 64gb of FLAC music in my pocket at all times. 

The speaker is alright for music, but surprisingly useful for movies and videos. Xvid videos from perfectly reputable sources (cough) look amazing on the AMOLED screen, and seeing them is the point where most ipod touch owners will acknowledge the validity of your purchase. But hearing them adds a whole new sense to the experience. Its actually a decent speaker, beating the tinnier apple speakers to my ears, and goes fairly loud. Great for showing your favorite movies or playing your favorite new track for your non-audiophile friends. 
The UI is just slick. I love it. It's so much cooler than the apple products I have used, customizable with user-created themes ( and has easy access to the J3's capabilities directly from the music and video screens. Cowon really listened to feedback it seems. This UI is just a joy to use. The S:flo2 aint got nothin on this.
Extra battery life - more to love. I mean seriously, 64 hours battery life for music is almost overkill. But 11 hours video on the J3's amazing screen is perfect for long commutes and trips. And who wants to worry about charging their mp3 player all the time? I watch friends having to plug their ipods in halfway through the day and smile, knowing that I could listen to music for almost 3 days straight without stopping to plug in my J3. 
In short, I'm loving this little miracle so much, and I'm sure it will get even better in time. It's said that Cowon players have a slight treble emphasis. I can clearly hear everything in my music with the J3 and Westone 3 earphones. So no worries about out-of-control treble - there may be a slight emphasis, but everything sounds great to me. Another note about this pairing is that the Westone 3's, which hissed slightly with my S9, have NO hiss whatsoever with the J3. I can't hear anything but the music. And it's reproduced so beautifully. With the EQ off, its just me and the music. But using BBE EQ effects, it becomes an infinitely customizable music experience, which is really nice when plugging into my friends' stereo systems.
Get one now and stop being indecisive. You know you want one. 

Pros: Compact, lightweigth, very good sound (for portable)
Cons: Feeble USB / mm card cover, software stability issues at low battery
Needed a good player for my FLAC and APE files (which my iPod could not do).
Bought this player on the various internet recommendations although its ridiculous expensive in Europe (239 Euro for 16G version).
It's a very good audio player in a nice looking package. It drives my RS2 very well and playes all files effortless with good dynamics and musicality. I like the added BBE equilizer settings, especially when playing at work on low volumes to get a bit fuller sound. Battery life is awesome and I love the OLED display although I guess I will not use video much.
User interface is ok, but not as nice a the iPod's, but that might be just me. I have big fingers and hands and the controls (on screen) and at the player are tiny. Changing the volume often causes me to switch off the player as that button is at the opposite of the housing.
When the battery was flat, I had some issues when I tried to start up the player. The software went instable and I had to use the reset button. Troubles luckely disappeared when the battery was charged again, so I guess this has something to do with the voltage drop of the near empty battery.
Bottomline is that I'm happy with my purchase and love the sound.

Pros: Storage, a palette of EQ settings, ease of navigation
Cons: I should have bought this first!
After trying player after player to include the 602 I have come to realize this was the perfect match for me.
I too use the UM3X, but also Grado 325i's, K702's (300ohm) and Senn IE6's. This player just wants to push them all. Aside from the 35 presets The EQ settings are ENDLESS! (there are 4 available to dress to your hearts content)
I didn't need to find phones with the right "synergy" to make it sound great! Heck IMO if you pay $300+ for a DAP it should match at least something in your arsenal .....
Bottom line, I love it, great sound, great vids (I just found out but probably will never use), easy to navigate. Once again let me say the COWON J3 is a great, great player.
Pros: Great UI, great battery life, even better sound, I just love it
Cons: Album art, and tags are sometimes abit messed up, but they can be fixed pretty easy with MP3Tag
Well I sold my S:Flo2 for this, and I'm happy I did, this is alot better every where, as great UI, Battery life, and sound, also plays AAC, and works with album art most of the time
overall I'm very very happy

Pros: Excellent sound quality, customizable UI's, fantastic batter life and beautiful screen
Really the perfect music player, with the expandable memory slot its just fantastic. 
Pros: style, size, battery life, SD card slot, Touch Screen, Power and Sound
Cons: propriatary usb cable, just like everything else.
[size=medium]I love having something no one else has, that’s how I live my life making my own path.  At least that’s how I feel when someone gawks at my J3.  Every third person on earth has an IPOD, nothing to talk about, no fun, typical, average,  yawn.  Now the J3 is a special player in every aspect.  When you pick up this shiny black glossy unit you expect a lead weight.  However the unit is light as a feather but strong like titanium.   Then you power it on as a thin blue line scrolls across the screen and then the touch screen icons which react to orientation of how you hold the J3.[/size]
[size=medium]However I couldn’t truly enjoy my love for the J3 until I added and upscale IEM.  After weeks of searching, reading, asking (Then being rebuffed for not searching) then more searching.  Flopping from one device to another.  Should I spend a lot or spend a little and get several $50 and below.  Will ebay ship me a Chinese fake since they lead the world in that area.  Back to asking an be rebuffed for not searching.  Finally I settled on getting the best I could afford the Weston UM3X. [/size]
[size=medium]Making the purchase click, the wait begins. Then the sound thoughts float in.  Buyer’s remorse, read more reviews, maybe I should have gotten…   [/size]
[size=medium] Look for affirmation.  Read, Read Reading everything while the family goes waning for my attention.[/size]
[size=medium]Then the UM3x arrives, I immediately grab the J3 and plug it in. I go to setting and turn off EQ’ing off so I would have a good baseline reference.  Tapped the music icon and my ears fill with the most warm punchy bass, clear highs and better than expected Mids!  Tap, Tap to double check that I don’t have BBE+ enabled and it confirmed no EQ’ing and it sounds wonderful.[/size]
[size=medium]Bottom line I love my J3 pared with the Cowon J3 my search for quality music listening is over the ripping continues.  [/size]
lovely... is it gapless too? :O it's such a shame i can't get these in méxico. :frowning2:
Pros: Battery Life, Sound Quality, Screen
Cons: Build quality could be better, but it is not bad.
I'll update this at a later date.