Treo's are notoriously picky on their bluetooth headsets. I have tried Jawbones, Jabras, Motorolas, Plantronics, etc. Some work a little better than others, but all have at least some issues with the treo 750P and 755P's. This one works. No missed calls cause the bluetooth won't connect. it's not the best sound quality in the world, once in a while someone will complain that they can't hear me, and I'll have to toggle back to the phone set, but since it actually connects to calls every time, I figure sound quality is not my primary concern.. missing a call altogether is worse! BTW, this is generation 3 of Palm's own line of bluetooth headsets, and I did not find it to be better in any way from generation 1, but it is no worse.. it works.