Not had any problems. But XP is 100% worse than OSX and the only reason I have it is to show people how it works.
I have scored an 8/8 success rate when convincing people to buy a mac, on the basis that windows works, but telling them to live with OS X for a months. Now they don't understand why they liked windows at all.
Try it. 30 day challenge. Remember everything on windows is available on mac, just under a different product name, and the forum's here to help! And if you're a gamer, just use XP for that...