So I got a brand new 2012 MBP last week. It's been great, it's just unbelievably fast, much better than I expected. However, I'd had some issues with the magic mouse, nothing serious but it seems to become quite 'jerky' from time to time. My signal strength is about -60dBm from about 3 feet from the computer and it drops to -80 at 6 feet. The jerky movement seems to be completely random, but still very annoying. What's sort of signal strength do you guys get? (signal strength can be monitored in bluetooth prefs by holding the alt key while your mouse is selected or clicking on the gear and selecting monitor RSSI).