Well, I've been using these for 10 months, and I realized that I havent done a review for them, so here we go. This is also going to be a comparision againts the Superlux 668B.
 
First, I have to say that these headphones are somewhat underrated, they're way less popular than their brother (668B), and these deserve as much attention as the 668s or even more!
 
So lets start, Evos and 668s have two things in common, their soundstage and their V-shaped sound, the rest is diferent. Although both have a V-shape sound, Evos are also warm, with a great sub-bass thats really present and shines with Classical music and Jazz. (While 668s are really poor in that aspec howeer 668s have a faster mid-bass that I really enjoy). To resume it, Evos are Warm V shaped and 668s agressive V shaped. So If you're doubting about picking one of them you should really consider what headphone you want, because they are almost completely different.
 
Now lets go with the mids, they still have recess mids, they're present enough, even a little bit more than 668s and thanks to its timbre that we gonna talk on a moment, they are better.
 
Highs: Very detailed, not as much as 668s, both show recording mistakes easily, on the 668s you will heard any clipping/distortion right over the rest of instrument, on the Evos you will hear it too, but in this case they sound behind the rest of instrument, I would even consider this a good point, since some games soundtracks really have a poor quality and on the 668s is really hard to enjoy them (I'm looking at you Ace Combat X -.-)
 
Their highs are surely softer and with their amazing timbre that omg, really this aspect is something that surprises me a lot on the Evos, that Timbre makes everything sound better, more natural, 668s are well know for their "dry" timbre. thanks Superlux to for fixed it!
 
Now lets talk about gaming, and with that I mean soundstage and positioning, both headphones have a similar soundstage (Its really hard to tell to be honest) but I would say Evos extend a little bit more horizontally and less vertically.
 
However, Evos do depth and audio positioning amazingly better, I mean, I no longer game on my 668s, they could have as much detail as you want, but Evos positioning is brilliant, Now playing CS:GO it is super easy to tell when someone is coming from your 8 to 4 O'Clock (668s really struggle there) If you have both headphones, please tell me how do you find their positing on CS:GO, because maybe I'm crazy. xD I wasnt expecting that at all.
 
But they have a fatal flaw that really bugs me, and it is their build quality. Why???
 
I've been using these for 10 month, I've already recable them (the little cable that goes out of them broke off), the two metal beams that goes over your head have one tear each on the middle (although there's metal inside them, so this is not fatal) their headband have like 10 tears, all of them fixed with superglue that really prevents them from getting bigger.

I really dont know why this has happened to me, My 668s are one year older than my evos and they are still fine.

So, I do recommend this headphone to everyone, but you have to be aware of its building issues, if that really does not matter for you, go for them!
 
 
UPDATE: These were my impressions of the Evos plug on my Xonar DG. Recently, I performed a test between my Xonar DG and a ELE EL D02 and I realized that they sound better on the ELE DAC, basically that "slow bass" is gone (It is still slower than 668s bass though).
 
http://www.head-fi.org/t/677895/ele-dac-support-and-appreciation-thread/105#post_12043224

First that all. Im gonna say to all who wanna buy these that these headphones need Burn In, You will notice too much highs the first time. And yes, that was my first impresion of these, Too much highs and sibilances, but after a week I started to notice a improve in the highs and they started to sound awesome.
 
So lets start with the Sound:
 
Bass: Punchy/Fast Midbass, Sub-bass is weak, but overall they give enough bass energy.

Mids: Nothing special here. They´re OK. (Even after this edit I cant still say something bad/good about their mids, they are OK.)
 
Highs: They are bright, These highs are amazing, they give them more energy, trumpets, Saxos, Cymbals sounds amazing. I dont understand why some people say that these are too harsh or they have too much sibilances, yeah they have sibilances but I dont feel them excessive or annoying.
 
Also, their timbre isnt the best, somewhat dry,
 
Gaming: Very detailed and relly good soundstage, I remember my first COD 4 match with these, I even heard enemies across the COD 4 Map Showdown. That was awesome and since that day. I cannot play without them. (Edit: This is no longer the case xD).
 
Edit: I recently posted my review of the Superlux 681 Evo where I compare them a lot against these headphones: http://www.head-fi.org/products/superlux-hd-681-evo-black-professional-monitor-headphones/reviews/14340

I had very good expectations on these, after reading all the good reviews and even seen people comparing these with 80$ or 100$ IEMs.
 
Well, when I finaly got them, (By the way I received them on my birthday) I was so happy, then I open the box and I was like a little kid with his toy. xD
 
Then I looked at them, they have a very good build quality even the cable looks sturdy. So everything was good Until I heard them. Well, I dont like to say this, but they sounded really bad at the first time, so I knew about "Burn In" and I didn't lose all the hope, so I left them more than 4 days with Pink Noise at average volumen.

When I Finished the Burn In, Lets say how they sound now:
 
Bass: Very good, its the only good thing, the Bass goes deep and its powerful.
 
Mids: There are no mids, Jajaja Honestly. They sound like all the band is close to me, and the vocalist is 500m away. xD
 
Highs: Outstanding Sibilances xD. OMG I cannot even listen to some songs with these. I cannot listen to "Until The Day I Die" and they also have a peak around 5K. Its funny when a read some people complain about the 668B's sibilances, man the 668B's sibilances are nothing compare to these.
 
Overall, after this. Im afraid to buy others IEM's, Since I read that these are one of the Best under 80$ IEM's. So I hope that I got a bad pair, because I can confirm that these are not fake.
 
 
 
Despite of all I said. I'll continue recomending these for those who wants a cheap IEM's, before tell you to buy the Koss KSC75 which I considered far superior than these except for the deep bass.

First that all, I called them Pieces of ****, because they look incredibly cheap and ugly, but they sound really good. They remind me a lot to the 668B, both have a fast bass that lacks Sub-bass (On the KSC75 that lack is worse), both have a sort of dry timbre, and both have great highs (Depending on your tastes you might find 668s highs a little bit too bright). To be honest, I find the KSC75 highs a little bit lacking. xD

Soundstage is very good, it is a step back of my 668b's soundstage.

Their clips are comfortable, but It takes a while to put them on. However, you can buy "Parts Express Mini Stereo Lightweight Headphones" on Amazon and use its Headband on KSC75s.
Overall, for 15$ You wont believe how good they sound.

Edit: I´m updating my reviews, I have to add that my KSC75 died (6 month ago) I´ll try buy a pair or even two pairs next year. Also I had the opportunity to try others portable headphones like HD202 and UE4000, and really, the KSC75 destroy the HD202s in almost every way and its on pair with the UE 4000.

UE4000s destroy the KSC75s on timbre and Sub-bass, However soundstage is wider and bass is faster on the KSC75. (I think this comparison is a bit unfair because you can buy almost 3 pair of KSC75 for the price of one UE4000).

Really, even after 6 month without them I cant still believe how good they were, and their biggest problem is how my KSC75 died, the died because their drivers themselves died (Not the outer cable) (It seems that the internal thin wires of the drivers broke up due to knocking).