I installed Vista onto my S5XP and it runs really well, obviously i have had a few apps not re-installing.
My biggest complaint was that Sony when i rang them told me they dont have a date when the pre-installed software will be available for download via the support site.
I really like Click to DVD and used it alot and feel that i have been hard done by after purchasing the laptop for £1300, but hey wot the hell Vista is cool.
Please Sony hurry up..