I have not installed it.
I'm currently using Win XP w/SP1a (GTPro). Seems to be working for now...
The general consensus that I've seen on this and other bbs is to stay away from SP2, at least until it gets used for a while (tested) by the general public.
From what I'm hearing, it's main benefits are security fixes...useful if your DAW is hooked to the internet, I suppose (mine is not, nor will it ever be)...
I've also heard/read that it can create problems for DAWs in the sense that it causes numerous other programs to be loaded into the startup menu.
My .02...
Tom