I've had this headset for over two years now. The audio quality is quite good, but it's ability to reliably peer with my Treo 700w is poor. I don't believe this is a problem with the Treo as I've had a cheap Cardo headset that peers every time (but with poor audio). I often make calls while driving, have Bluetooth on, and end up having to put my phone up to my ear while the Plantronics is in the other ear. I have to imagine that there are more reliable headsets that provide good audio quality on the market. I just haven't found one yet.