About a month back, I purchased a wireless mighty mouse and tried using it with my 2009 Mac Pro. The lag and tracking were terrible... making it unusable. When connected to my MacBook Air (on the same desk) it worked flawlessly. I assumed at the time there was a problem with the bluetooth on my Mac Pro so I've been meaning to get Apple Support on the case but just haven't got around to it (using the old wired mouse as before). Now, I'm reading some stories on the peripherals forum that owners of Mac Pro's have issues with lag and tracking with the new Magic Mouse, and some are stating that it's a known problem with the Mac Pro chassis that it doesn't enable adequate bluetooth operation due to all the metal. Is this true? What's your experience using a bluetooth mouse with the Mac Pro?