I have a MacBook Pro, and I love the tracker pad on it, but this is just a lot more useful.
The programmable buttons allow you to do so much more at the click of a button, and i haven't had any problems with the ball getting damaged, as it is still working fine 5 months after i bought it.
It sync'd with my MBP and was up and running in under 2 minutes, and didnt need any faffing about with CD's etc.
My only criticism would be, that it doesn't automatically re-connect itself with your Mac when you come back into range, you have to click the mouse for it to turn on, and it takes about 5 seconds to be ready for use again, but that is just me being inpatient.
Overall, a great piece of kit, if not a tad expensive, but hey... that's Apple, you get what you pay for, brilliant products.