Ive just got it this morning and it looks promising. Firstly I should explain that I have been using the superb Sony HBH-300 for the last few months. However, Ive experienced incompatibility problems with my new V3 RAZR whereby the connection between phone and headset is occasionally lost resulting in an incoming call not going through to the headset. This is quite a rare occurrence, but as is to be expected, always happens at the most inconvenient time. First impressions of the BT800 are favourable. It paired easily with the V3, its comfortable, voice dialling works, Bluetooth range is good and the audio both ways seems pretty good. Time will tell if its 100% reliable with regard to incoming calls going through to the headset, but so far I havent managed to trip it up. I havent tried it in the car yet though and that will be the acid test. I drive a pretty noisy car and the noise cancelling on the Sony really is superb.