I'm using Apple hardware about a year, and this is a first time I see such an improper solution: Apple Wireless Mighty Mouse. Well, the initial idea was great, scrolling in every direction, controlling OS X functions etc. But the implementation is way too far from perfect:

- mouse hardly distinguishes left click from right click so you have to click VERY right to get it working;
- Scroll Ball simply stops functioning after ~1 month of heavy use.

I made several attempts to clean the Scroll Ball, unsuccessfully. I could go further and try to disassemble it, but instead just went to the store and bought Logitech V470. Little less functional, much more practical.

Pictures (dead Mighty Mouse to the left, new Logitech to the right):