I switched to mac and love it The linux style backend is brilliant and the whole thing just feels smoother.

Not sure how a mouse can make your shoulder sore... but I'm sure you could find another mouse that doesn't.

Still, they're not for everyone and if you're attached to your windows programs there's no real need to switch. Though I have to say I don't miss anything on windows, there are equivalent or better programs available on mac for just about everything.