Despite what some people think, operating systems are a personal choice. I don't like Vista because (among other things) it gives MS too much control over what I can do with my computer, its licensing terms suck, and it costs too much for the relatively small improvements (at least useful to me improvements) over XP. That doesn't mean that everyone should feel that way or who what to change operating systems. (I happen to like XP. I think with proper tweaking, it's a fine OS. It's Vista I have real problems with.).
Ah see I didn't pay any extra for my Vista because it was standard on the computer. There wasn't really a choice there, I would have technically been paying for it whether I used it or not. Also, I don't do much with my comp. other than surf the 'net, chat, occasional artwork and writing.