My friend and I purchased a pair of these each last friday, and all I have to say is that I am amazed in the sound quality. I have let these play over night many of times to break them in, and they are gradually sounding better.
The bad part is that by the third day of owning them, the noise canceling works, only in certain positions that I hold them and at that it barely does it. The fifth day, my friend's does the same thing, but you can't wiggle it to turn it on at all.
We are both taking them back and getting replacements, but I really hope that I am not let down by getting a second pair and them not working.