"... one of these to use at home and I like it, it works great"
I got one of these to use at home and I like it, it works great. But I have this co-worker who had an old mouse and all day long I'd hear him scrolling: skritch, skritch, skritch, skritch, skriiiitch and it was driving me nuts. I even showed him how to use the page up and page down buttons, and placing his cursor on the scroll bar on the right of the screen but he wouldn't do that. I think he liked driving me up the wall. So I bought one of these and replaced his mouse with this one while he was out to lunch. Problem solved! :-)