How much I wanted to like these... I just can't. Coming from the analytical and clean sound from the RE-Zeros, I wanted to give a critical listen, but despite the fit and isolation being very good(as opposed to many others), I couldn't like the sound and had to put it down.
 
One of my friends is a TF10 fan, so I wanted to trust him and listen to these for a prolonged period to at least get used to the sound signature, but I just couldn't. Bass is all muddy and bloated, treble is aggressive, vocals are far away and I can't hear them(but with ear piercing sibilance), and on top of that imaging is not what I should be hearing from a $500 gear(yes, it is $500 here).
 
However, I do have to mention that the wide soundstage was impressive, and it was very comfortable when wearing on my ears(can't understand the fit issues from others). These lack major fault, but the overall sound signature and the imaging is not worth $500. I would say about $150, it is a reasonable price, but I still wouldn't buy it. $200? still a little too expensive, IMO.
 
Maybe my ears are so adjusted to the RE-Zeros, but even when I heard these before I bought the RE-Zeros, I remember having a similar impression, so I find these not my cup of tea.
 
Sorry UE, it seems many like these, but even at amazon price, I won't buy one(or maybe one for a gift to my future GF). at $99 RE-Zero which I decided to keep is better, IMHO. 
 
 
 
 
Edit : listening to it again I think I gave them too harsh remarks. Still the fact that the vocals are a step back is a big 'miss' for me.

Well, I'm new to headphones, and definitely not an audiophile...not yet!(planning to become one)
 
Previously owned AT's A500 and M50, and this IEM just blew everything away and made me sell these full sized phones. Their performance was very good, but the RE-Zero surpasses those cans in terms of SQ, comfort, and isolation. 
 
Edit: That was my initial feeling when I got the phone. Now I miss the M50, but even if I get mine back, I don't think the M50 will get more love than my Zero out of me.
 
I do see some room for improvements, but this isn't even their flagship, so I can't really complain. The treble details can be a little more refined(although it is the best I've ever heard - A500, M50, Aurvana Air, TF10pro),(Edit : the source was the problem)some songs require a little more bass(amping solves the problem).
 
What I've felt other than SQ is that these phones are small, solid, and EXTREMELY comfortable. I do admit I must have had some luck with this, but I once wore them for 13 hours straight(of course with several 1 minute rest, and I know that this is harmful to my ears, I am regretting). I once fell asleep on bed while wearing these, and after waking up, it took almost 30 seconds to find out something was in my ear. It is that good.
 
Get it before it is sold out. A must-have if you have a Cowon S9 or a Cowon D2, since they are compatible with this balanced plug. 
 
Edit : Not that the Cowons are balanced output, I'm not sure about that.