I have the 500, the one with the cord, I too wasn't too crazy about the battery deal. The cord doesn't bother me either. I'm not sure what the specs are on that but I did hear something like the lazer eye in the Logitech is like 7 times faster than the microsoft. It will even work on glass. The logitech won't even come close to doing that. I tried it.

most "LED" mice from both MS and Logitec are the same as far as responding to movement.

Optical mice update movement much faster then old "Ball" mice. The old problems with Logitec mice was it's drivers but as joe stated. they now work with most games.

By the way now that we are on this what do u play in PS2 port or USB ports
By far USB ports blow away the PS2 as far as speed and reading the respones times. Any one else

Opps i use USB ports all the way i hear thier is Firmawre out thier that make the USB ports that much faster.

Mouse Button 4 + 5
 

I purchased a microsoft 5 button trackball, do i have to install the intellipoint software in order for it to work with MOHAA? it says i must uninstall my synaptic software in order to run Intellipoint. If i do this will my touchpad no longer work? Does intellipoint run touchpads? i dont always like to bring my mouse when i use my laptop out of my house. Forcing me to always have that trackball with would be a pain.