This is my new baby. It is the Microsoft Notebook Optical Mouse 4000. Seriously, I think I am in love. I go through several mouses (mice?) a year, and I always find myself going back to the Microsoft versions. For some reason, a Microsoft mouse does not go through as many batteries as all of the other wireless mouses I have used. That is the number one reason why I love them. I cannot believe how quick and smooth this new mouse is. It also has a magnifier on it. You are able to but a box around an area and magnify it as big as you need. I personally don’t need this feature, but I know plenty of people who do. I bought it on sale cheap on Friday. I only bought it because of the name brand (and price), and I love it! I am seriously impressed enough that if they tried to show me some land for sale, I would consider buying it. If you are needing a new mouse, you should get this one. It is worth every cent and then some.