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#51
I really don't know... You don't really hear the success stories, and most people that can't get it installed can't be bothered, and really don't care enough to pop over to Sevenforums to ask. It's a tough one to judge really.
I remember XP SP2 giving me crazy headaches. I finally broke down and re-installed. It was my first reformat actually. So I learned some basics from it.
Vista SP2 was painless for me, installed from WU without a hitch, but I ended up doing a clean install anyway. I think I was bored or something.