I needed to replace my failing, decades-old Microsoft Mouse that I really liked using. This Microsoft Classic Intellimouse was one of the three devices I evaluated. Its a corded mouse so I would not have to worry about low battery conditions. It has two additional programmable buttons on the side. The mouse comes with an App that allows all the buttons on the device to be programmed on a per-application basis to perform often-used commands (e.g. copy/paste in MS Word, forward/back in a browser, etc.). And it was available at an acceptable price. After my evaluation, I need to deduct a Stars due to problem I had using the App. but the problem might be related to my continued use of the Windows Vista OS on my desktop computer. The problem I had is that the App would not run - possibly because of the Vista OS. This frustration caused me to return the mouse after less than a week of use.