I have been using this headset for about three months now, and while I am not intensely dissatisfied, it is certainly nothing special. I am using it with a Treo 650, and while it "paired" on the first try and seems to interconnect reasonably well, the volume I can get from the set allows me to use it only in relatively quiet areas. For example, it is useless in an airport, and I can barely hear it when driving at highway speed in my car (which is fairly quiet). The other concern I have is the distance I can move from my phone and maintain call quality. I begins to degrade rapidly at 4 to 6 feet with no obstacles in between me and the phone, which is significantly less distance than I expected. I can't really say how long the charge will last, but I have now used mine about 2 hours between charges without any issues.Finally, I am really pleased with tech support. My first unit malfunctioned after about 3 months, so I arranged a return via email, and they shipped me a new one the same day they received the old one. Not bad!