First I got a machine that looked great but the track pad was all jumpy. Tech support gave me some ideas that didn't help at all and then sent out a replacement. The replacement was really not in excellent condition at all, there were scratches on the screen itself as well as the body, so I didn't even bother checking if the mouse worked better - I returned both and will have to try a different model or seller. When I complained about the quality of the replacement, they said that excellent condition means there are no flaws that can be seen 12 inches away and my item fit that description. I wish I had taken a picture before I sent it back but it did not fit that description. Plus, I don't think scratches on the screen are the same as other cosmetic damage. A scratch on the outside isn't going to affect the user experience the same as a screen that's scratched up.