I don't know.. I just prefer the shape of the logitech mice, and they've always been reliable for me.
I had mighty mice die on me in the past.
My thoughts so far;
•Nice display, much nicer than my MBP (out of the box), and BIG
•Keyboard is very slick, no complaints
•No condensation/freezing issues, very stable
•FAST! My god, this thing flies with 4GB of RAM
•Resolution is great, multitasking with the extra real estate is sweet
-Didnt ship with 10.5.1 preinstalled, an inconveinience more than anything
-Might mouse isn't so ergonomical, could be better
-Ports at the back seem laid out backwards (FireWire furthest from centre-hole)