Bluetooth dongles - which ones work?

[Eitan Adler]

I'm looking to get a bluetooth dongle that will work with freeBSD. I
have heard from various places that bluetooth dongle support is
hit-or-miss. Can anyone provide any advice as to (a) which ones are
likely to work and (b) anything I should be looking for regarding the
specs of the device?

Please keep me CCed as I'm not subscribed to bluetooth@