The Apple Mighty Mouse looks quite good, IMHO, but after only a few months the scroll wheel starts behaving oddly. I have both a wired and a wireless (Bluetooth) version and both have stopped scrolling downwards.
This appears to be a widely known problem with these mice. However, the main hurdle is that they cannot be cleaned internally like older mice could be, in the past.
Just a warning for those who consider buying it: make sure there’s no dirt coming anywhere near your scroll button; poking your nose is a recipe for quick disaster 🙂