I may say that I'm very happy with this adquisition. I own a Blackberry Curve, which I don't use for music playback, but, just for curiosity sync-ed with the headset, and worked fine: good sound quality, good playback control, volume control, etc.Then, I tried with my mp3 player (Samsung Yepp K5 and a Jabra A120 audio adapter). Obviusly lost playback control because of the mp3 cappabilities, but still happy with the sound quality. Then, I tried my blackberry and my laptop (HP Pavilion dv2320US) and a Belkin BlueTooth adapter... sound quality really good!!! And also you get playback control, and the pause/play effect if you receive and incoming call.In conclusion: sound quality depends a lot on the audio source!. Obviously the headset is not totally perfect, it is suitable to radio interference, but works fine and sound very good!... hope Jabra someday makes them tinier :-)