I bought a way over-priced Kensignton Turbo Mouse, and don't regret it in the slightest. It is wonderful to use, very rugged (I don't want to think of how often it has been dropped). and has been used on everything from my IIgs to a Mac mini. Given that it is 6 years old and still working properly, the over priced bit doesn't hurt in the slightest.

I don't have much experience with optical mice. Just a few ancient Sun mice and the Mighty Mouse. The Mighty Mouse scroll 'wheel' is too small, side mouse buttons are too sensitive, and it tracks worse than a mouse with balls.

/me runs to his Turbo Mouse and cuddles it.

/me then runs to his model M to cuddle it, so that it won't get jealous.

/me starts wondering why everyone thinks he needs to see a psychologist.