I recieved this headset in the mail yesterday. I was very excited to try it out. While sitting at my computer working this unit seemed to work pretty well. However, this unit for some reason, will not allow the person on the other end to hear you when they make any noise. So, if you are talking and they, comment, laugh, burp, or whatever...it blocks you out. This is impossible to use in business or even casual conversaion. I can not have a Walkie Talkie type of thing going on. The other person will miss half the conversaion....its not very practical. The other thing that is horrible is the road noise in the car. I drive a hour to work and a hour home and this is the primary use for this device. The headset picked up my voice just fine but also picked up and amplified the car noise...this with the sterio OFF. I didnt even attempt to try adding additional noise. Size wise this headset rocks....ease of use is great, and the options are nice. This is the only reason why this unit gets any stars.FYI- This unit was paired to the Motorola Razor and the Nokia 3660 with same results.