I have a logitech keyboard/mouse set that I have been running for the past month on my Mac Pro. Due to the extra buttons on the mouse and keyboard (multimedia keys etc) I was kind of forced to install LCC to make use of the extra keys. However I have found that software to be extremely buggy, and a massive resource hog (nb. this is on a 2.66/2GB/1900XT Mac pro). Booting up with various different usb devices plugged in, the LCC driver would reset my mouse preferences, and the extra keyboard buttons would stop working. Playing around with parallels and VMware USB settings would sometimes do the same thing, LCC driver would crash and require a restart to get full mouse/keyboard funtionality. After uninstalling, I am currently using Steermouse and controllermate to get the extra functionality back, and I must say its been the best thing I did! Overall desktop use is snappier, things like expose work faster and smoother, and things like using the multimedia keys for itunes have a much quicker reaction. Just a bit of advice to anyone who is stuck with the craptastic drivers from logitech. The only good thing about the program is that it uninstalls relatively cleanly!