I'm not a audiophile, so I think the sound reproduction is quite good and enough for me.
But I have to say, other than this, there are several obvious and severe problems that cannot be ignored.
Firstly, the two parts with the "Q"s on each phone are actually two plastic plates that are attached to the headphones. Unfortunatly, the one on the left phone is quite loose, which means it wobbles, and with every movement of my head, it makes sound which I can hear clearly while listening to music.
Moreover, I ordered a replacement for the 1st one I bought, but I was astonished that the replacement had the exact same problem.(I'm sure it's another pair)
Secondly, also for both the original and the replacement, the in-line remote control does not work with my iPod classic, but I think it's because my iPod is quite old as I got it about 4 years ago. Never tried with an iPhone, but doesn't work with Moto Milestone 2 (Android)as well.
Thirdly, they are a bit tight I think. I don't have a big head, actually some of my friends refer to me when they talk about someone with a small head. But I still think it's tight, but anyway, it depends.
P.S. The very short cable is quite good if you put your mp3 in your inner jacket pocket. The carrying case is good as well.