Given that the Apple Mighty Mouse's scroll ball has a nasty habit of not functioning properly after just limited usage, it has gotten a well deserved bad reputation. Even the cheap throwaway mice I get at the hole-in-the-wall PC shop in the $5 surplus bin never suffer this problem, yet Apple's pricey Bluetooth mouse does.
But that's not the worst of it. What's even worse is when the batteries in the mouse (or keyboard) die. Put in new batteries, and... nothing. Half the time the computer refuses to recognizes the mouse (or keyboard). Turning it off and on again helps once in a while, but the only really consistent ways to get the computer to re-recognize the mouse (or keyboard) is to reboot, or to manually set it up again from the Bluetooth preference pane. Very, very irritating. What about not letting the batteries die? Doesn't help. If you swap out the battery it's the same effect. Reboot may be necessary.
So lately I've just taken to putting my Bluetooth keyboard in the cupboard, and using a wired keyboard. As for the mouse, I've still been struggling with the Mighty Mouse, but won't get another one with my next iMac. Even if they introduce a brand new multi-touch mouse, they'll have to do some serious marketing to win me over if it's Bluetooth. The proof is in the pudding, and so far Apple's Bluetooth pudding is pretty rotten.
However, if they offered a wired multi-touch mouse, maybe I'd get that instead. Or perhaps a Microsoft RF mouse. Wireless, without all the Bluetooth headaches.