We have two of the predecessor to the one you linked to. (Logitech Wheelmouse, optical, wired, 2 button with scroll wheel which is also a 3rd button) They have to be at least 3 years old, or older, still work flawlessly and they feel good ergonomically too. They do everything I need them to do without installing the potentially funky Logitech software.<br><br>Chris<br><br><a href="http://www.light-imagery.com/index.html"target="_blank"></a><br><br>