My mouses (sic) tend to last a couple of years. Main reasons are that I buy them on the cheap rather than the proper choice of Logitech/MS product. I'd go for more expensive stuff but then I see the wife clicking with increasing violence and with her indicator finger reaching considerable height before slamming on the buttons when things don't quite work as she expects. Can't wait to get a laptop with a touchscreen to see her punch that Start screen.
My first mouse cost me EUR35, had a huge rubber ball and worked better to move the cursor to the right and down than in other directions.
I had a A4Tech mouse that was wireless but had a very weak sensor at the end of a long USB cable. That setup was clunky as hell under the desk. It worked fine with line of sight, not so great otherwise.
I once had a mouse branded Trust which outlasted the keyboard that was part of the set. I bought another set hoping I could mix and match. mix and fail was more like it.
I used a Microsoft optical mouse with a Mac and I think this was the one that lasted the longer, despite being used by everyone back at home, including 4 year old kids.
I currently have a Logitech mouse and keyboard combo and the mouse scroll wheel is becoming too old to register middle-clicks.
With my work laptop (HP Elitebook) I sometimes use a HP bluetooth mouse which loses signal every now and then. The same mouse worked fine with a Dell laptop but seems to dislike being paired with a HP machine.