I've got 4 pc's, 1 with xp on, 1 with Ubuntu Server, 1 with XP and Vista, and newest with Vista. I've installed Vista when it's project name was still 'longhorn', and immediately removed it. Nóthing worked as intented. I also installed Vista beta 2(beta software is only for testing purposes), and expected it to work at least a little bit, but didn't do so at all. When Vista was officially released, I waited with installing as primary OS, because of véry weak security and problems in general: Vista just wasn't ready to be released yet: it didn't even work with nvidia audio chipset, which is probably the most widely spread éver.

2 weeks ago, I installed it on 2 machines, with an updated release: éverything worked immediately, I only had to install drivers for my graphics tablet, and behringer bcd2000(of which I don't even expect them to be in the standard package). I did still get really upset with all the 'security' pop-ups(really, éverything that happened, needed multiple clicks to finally be executed), but solved that problem by installing the pro version(think free version does it too) of TweakVista. I also removed sidebar, because I'm used too using yahoo widgets, which also uses a lot less system resources.

I do recommend using Vista only with software that's quite new, and always install older software in compatibilty mode for Windows XP SP2(right-click on setup-icon, click properties, click compatibility, choose XP).