I purchased this mouse in January 2009, after replacing an older computer. I had used one before and wanted to buy a new one but could not find it in a store . The price and function of this mouse is great. It is the only one that I want to use. If you have not tried it then I recommend you buy one and start using it instead of the regular mouse or wireless one. I give this one five stars.
This is by far my favorite style of mouse. This one was purchased for a friend who admired the mouse at my desk. Last year my husband bought four for each of this office computers.
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Logitech Marble Mouse For IBM Compatibles and Macintosh Systems 8.5 or later (note: Replaces Marble Mouse for Serial and PS/2) Logitech Marble Mouse fits right and left hands like a mouse and works with the convenience of a trackball.