My Mac Pro never had a decent Bluetooth signal which I think is a common occurrence. It was so bad that I got the BTX Bluetooth Range Extender (http://www.applelinks.com/index.php/more/btx_bluetooth_range_extender/) which I'm pretty sure is just a BT dongle. Still had problems until about 10.8, during which Apple finally got off their lazy butts and fixed a bunch of USB bugs that were also causing problems. Fast forward and I'm still occasionally getting BT problems. Erratic laggy performance, looking at the RSSI signal I'm seeing a solid -45dBm which is better than any other computer, but it still has problems. Moving the dongle around doesn't make any difference. Yet another problem with my Mac Pro ... any ideas?