I absolutely love my Logitech dual optical. It's symmetrical (which is good for us lefties who are living in a righty world), it's low profile, and it's extremely responsive and accurate (800 dpi). I wouldn't mess with the cordless stuff though. Too much hassle with changing batteries and all. I just like to sit down and scroll... Don't want to be worrying about changing batteries in my mouse.
*Edit* Never mind about the wireless talk. I see from the other posters that you have a charging station for the cordless mouse now. That's pretty cool. Obviously, I've not had a cordless mouse for many years. It's good to hear that they are staying innovative in that area. Maybe I'll get a cordless mouse one day after all...