Well, I've searched high and low, and returned (too) many a BT headset in my search for one that I like. I've gotten used to the fact that BT is never going to be great on the 650, but I found one that doesn't hurt my ear, pairs (without needing to re-paired) to the 650, and is loud enough (when used with volume care/BT Mute.

The unit is the LG HMP 710. It rests gently just outside/alongside the ear, without going in (uncomfortable and distorts the sound that way). It's lightweight too. From the postings I've read, it seems others are always looking for the "HOLY GRAIL" of BT headsets for the 650. For me, this is the one (a good deal for $39 too). Hope this helps some other users....

LG makes some of the best phones, but of course, I needed the 650 for what it can do, that none of the LG's can't.