I have a logitech click! mouse. I bought it mainly because the laser thingy is much more accurate than the standard laser thingy.

I like it but what really bothered me about it was the software that came with it. It wouldn't allow me to customise the button functions per app, which is ok, I could live with that, but if you don't apply a function (one of their functions) to a button, leaving it blank hoping that it will let you keep using it the way the particular app uses it, every time you press that button it pops up a window telling you the button has no assigned function and you should press here to assign it.... grrrrrr!

So I turned off the retarded logitech software.