Um, I don't want my mouse to have software features, I just want my mouse to last a long time. My Intellimouse Pro accomplishes that, and in that time my wife has gone through 2 off-brand mice, 2 Logitech mice, and is now on a Razor. If Logitech makes something competitive with my Intellimouse Pro, I'll probably get it. All I need is:

• left and right click
• scroll wheel and middle mouse click
• back and forward buttons
• bonus points for some kind of side scroll
• sensor on the bottom to track movement
• reasonably comfortable

I don't need macros, adjustable weights, LEDs, etc. I don't want fancy software or any of that jazz. I need a reliable mouse that's reasonably comfortable. If you add a thumb button and add macOS support, I'll pay a small premium. If I really like it, I'll probably buy 5 (work, desktop, laptop, wife desktop, kids computer).