I tried about 4 different headsets for my Treo 700vw before finding this one. I have been using it for about 9 months and it is great. The only difficulty is remembering to answer the phone directly from the headset, otherwise the speaker on the phone is turned on. Which is good when you can't find your headset, because previous headsets would turn on even when I wanted to answer a call directly from the phone.After my treo software upgrade, it became a little more difficult to pair the headset, but once it was recognized, I haven't had any problems.I definitely recommend it. Very stable in the ear, light, sturdy, easy to switch ears and long talk life. I can usually go 2-3 days without charging it.I don't know whether it's Treo's or just bluetooth headsets in general, but it took me months to find one that worked well. And this one has been great.