Summary: With a few minor changes this mouse could be fantastic. If both the DPI settings were doubled and the scroll wheel was flat this mouse would be the best wireless mouse I've ever seen.
Pros: Perfect size and shape (other than the scroll wheel, see cons). My hands are average size and this fills my hand perfectly. Convenient DPI switch button. Easy to press if you need to but hard to press by accident.
Cons: The scroll wheel is rounded on top. It gets uncomfortable after using for a while. It was also pretty stiff to start with but eventually it loosened up... maybe too much. Occasionally it will scroll up and down repeatedly without me even touching it. If I turn it a bit it will stop so it's not a big deal. Wireless receiver is pretty big. It's not the mini one that the smaller Pro Fit has. Not a big deal for me. Battery cover could be easier to remove. 1200 dpi is pret...
Excerpt: Replaces another highly rated Kensington K72278US portable mouse, which is also an excellent performer. Prefer Pro Fit's mini usb and thicker contour grip... less fatigue... and sensitivity is better on slicker surfaces.