I have to admit most of my co-workers like this headset, so I was optimistic when I bought it. I've owned several Bluetooth (2 different Motorolas, 2 different Jabras, and the Treo) and sound quality versus fit often seems to be a tradeoff. Same story here: good sound but bad fit.This does seem to have better sound quality if you place your hand over the headset and hold it into your ear. The headset will stay for a minute or two and then pop out. If I'm driving and put on glasses it will not stay in ear at all. I've tried both ears (2 loops are included for each ear) and all 4 inserts. I wish someone made the fit and on/off ease of the Motorola 850, but the quality of the Jawbone.