Considering i bought 2 copies in the last 2 weeks, i'd say its plenty stable. Running home premium 32 on my media pc, and home premium 64 on the gaming rig. Vista just takes a little time to get used to. Also, if you already own a legal copy of xp theres no reason to upgrade. I built a media pc and would have had to get a media center copy of something, so i went vista, and i needed a 64bit copy of windows for my gaming pc, so i went vista there too.
Nothing to see here.