I've been using the Z-9 Bluetooth Headset by Blue Ant. The sound quality is excellent; I also like like it has a noise-cancelling option (just click the multi function button) that realy helps in noisy environments.Prior to buying my iPhone and the Z-9, I had used another Bluetooth headset that had a wimpy battery life; I ended up tossing it out. I originally gave consideration to the headset sold by Apple with the iPhone but after checking the reviews, I saw that it had some problems and was difficult to adjust. Some reviewers claimed that it broke while they were trying to adjust for their preferences. Since I drive a lot and work on my computer and with hard copy documents, having my hands free is the way I prefer to be. Do any others use their bluetooth headsets a lot or do you just use it once in a while?