I use a bluetooth headset from time to time and the thing to know is there is a bit of latency. Some bluetooth protocols are advertised as low latency but I haven't tried one of those yet. Not usually a problem with voice but for CW it can be pretty distracting to try and send with a delay in the sidetone. I've used it in the car to listen to the V/U rig over the car stereo and that works pretty well.
Mark K5LXP
Albuquerque, NM