"Black/Gray v220 $10 great value at CompUSA 03/31/11"5.0 starson by jkeese
Pros: - Works on the rough fabric arm of my sofa just as well as a mouse pad.
- Uses 1 AA battery (included)
- Great size: not too big or too small
- Off switch
- Not jumpy when transmitter is connected directly to the computer's USB
Cons: Good idea to download the software for the mouse so you can program the wheel as a 3rd button.
I programmed it to close the browser.
The software allows a large number of options to customize the buttons.
Summary: Great mouse that allows customization of buttons with downloaded software from Logitech.