I got a BH-201, usually it works fine, but every once in a while it won't connect until after i cycle bluetooth on the N900, and while the headset is connected the N900 has issues with finding nearby devices (like for sending a calling card). Back in pr1.2 often it would not shutoff the speaker (there was a bug in pr1.2 that would keep sending "silent" sound to BT headsets), that has been fixed on pr1.3 (but now every time a sound start after a little bit of silence the headset interrupts it a few milisecs after it starts to sound it's own beep for some reason, and then it will resume the sound from the N900 if it isn't over already, quite annoying)