hey, 6 weeks ago i used the Mighty Mouse (wireless) for the first time, when i got my MP. i hated it. and i used the MX Rev instead. but i have changed my mind now.
for general use, i definitely like the MX Rev better. with a bunch of customizable buttons, it helps me switch apps fast, surf web fast and convenient. the scroll wheel is just great. and many more. i have a tripple LCDs setup, and this mouse helps me travel across these monitors conveniently. with the Mighty Mouse, it takes me forever to move around the screen, eventhough i set the tracking settings to maximum.
however when it comes to image editing, i find the Mighty much much better, especially with precised details.
so, i now using them both.