I bought these headphone about two weeks ago and they are pretty good.
Very good sound with incredible bass reproduction considering their size!!! Don't use cheap MP3 players with EQ presets like my old MP3 player because the low frequency range is overemphasized with virtually every EQ preset. But the headphones are very good for MP3 players with a real EQ.
I only miss some sort of system to coil the cable because it gets tangled pretty fast inside your pocket.