VZW VX6600
Rambo installed BT3500 "C" build

Motorola HS820
Only worked a couple of times. I shouldn't have bothered based on the feedback here but it was on sale. (It is going back.)

Plantronix M3000
Worked great, of course. Great range -- I left the earpiece charging downstairs and when I used the phone upstairs, it connected to it. The earpiece was not as uncomfortable for me as other's have reported here.

Jabra 200 (a couple of years old but hardly used)
Worked fine, surprisingly, after I figured out how to pair it up. I lost the manual long ago.

**If** I keep the VX6600, I'll use the Jabra around the house (it is very comfortable) and otherwise use the Plantronix.

I haven't been able to pair up my T41 Thinkpad (built-in BT) with the phone.