I'm no audiophile by any means, but I've been very happy with my M-Duos. I'm using them as I type this in fact. Sound good to me. The Brainwavz headphones I got in the other drop were way crappier sounding than these.
AmnNateI have joined the brainwavz grab bag. It is terrible compared to most entry level earphone. If you really look for a headphone, don't join this one. I just take this as a lottery.
I've yet to hear anything positive about them from any informed sources.
However, I have a heard a bunch of "they sound good to me" posts. Which isn't very comforting.