Just a quick note about these. My point of comparison for Audio Quality is Senn HD650 / LCD3 / Grado 325is / ATH-M50.
 
Comfort - Amazing. Gets slightly warm after really long listening sessions, but they mostly rise to that level where you forget you have them on. The cups are like pillows. Personally, after a couple of minutes I don't feel the "pressure". They are probably my most comfortable headphones... The Senn HD650 is close but the clamping is a little excessive on those. 
 
Sound quality - Decent. They are a little muddy. The clarity isn't quite there. Specifically the bass is muddy, sometimes overemphasized, rarely as clear as it should be. The mid bass hump is ever-present.
 
Great Unamped - They work extremely well out of an iPhone. I find that amp / dac add essentially nothing. 
 
Design - I find them ugly, personally. I love that they include a functional case. 
 
These should be seen as companion headphones for when traveling / out in public, you should not be primarily using these because they rob the music of fidelity.  I use them either when travelling or when neighbours / roommate are being loud. They do what they were intended to do reasonably well.

These are a great pair of cans all around. Very few complaints. Fantastic value. I've been driving them with E17 / E09k - it may not be perfect but it sounds great to my ears!
 
These are the kind of headphones you forget you are wearing because they are so comfortable. The rolled off treble is great for long listening sessions.
 
I find that I tend to use them when I want my experience to be a little bit hands-off. The sound, the feel, etc. is all very comfortable. The bass is a little bit underwhelming, but it fits the 'comfortable' experience.  They are nonetheless quite detailed. They aren't bad at really low volumes, but I am more likely to reach for my grados if I want really low listening volume with clarity. 
 
The build quality is quite good. I am worried about the paint chipping though. 
 
They are a massive step up from entry level headphones and IMO about 75% of the way to hi-fi headphones (e.g. LCD3). 
 
In my opinion they work quite well with all genres of music, but are a little bit too laid back for rock. 

Thumbs up!