Pros: Great noise cancelling with *good* sound, works extremely well out of an ipod
Cons: Lacks some overall fidelity, unnatural bass
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.