Installation was very quick and easy. Vista installs using 4 ISOs, so for the first 8 minutes or so, you just need to reconnect the correct ISO via Parallels ... no problem.
Boot-up is MUCH slower than XP, but once booted, it is actually quite quick. I haven't installed Office or anything like that yet, but will have a go at it as soon as I can. Oh, set it to use 768Mb memory to speed up installation, gonna switch back to 512Mb to see how it handles it with a bit less memory.
Vista impressions: Not too sure yet (I just completed the installation). It does look pretty, but not too sure about the added features/benefits. And it is totally different UI to get used to ... back end principals remain the same, but I have to look for certain things, as they are not where they used to be