Be prepared to send your B2 back when it breaks. Yes that's when not if. I don't know anyone, myself included, who hasn't had to send it back at least once.
 
Mine decided it didn't want to power on in the car yet worked in the USB cradle.

Admittedly it came back from Origin within a few days, but that's not really the point.
 
Mine didn't make any noise at all.

The replacement unit worked fine for 2 years but then stopped seating correctly in its cradle and just beeped a lot.

Shame, because I still think it's one of the neatest units available and when it works it works superbly. :(