I have Vista Ultimate on three computers now and I totally love it. I do recommend that you buy the full install versus the upgrade and the reason is, if you ever have a problem and need to format for whatever reason, with the upgrade disk you'll need to reinstall xp first, then vista... gay I know.
Buy the full version, upgrade to it and enjoy!! Make sure you have a good video card and lots of ram!!!! BTW, it's not slower.
