It isnt just Office or Vista. It has EVERYTHING. When i say everything i mean that. You can get Visual Studio, Visual Basic, Longhorn Server (Windows Server 2008) Vista, XP, 2000, Office XP, 2003 and 2007 (All versions from basic to Ultimate), among more.
Basically any Microsoft application that was released since 2000 is on there. Which you can access and download with legit serials. So yeah it costs a lot. But what you get is so much more. To have full serials for all versions of Vista, XP (including the N versions for hte UK which makes 2 serials per version and MCE) Office is enough. But when you can get Betas as well. I got the Visual Basic 2008 Beta already. Web Expressions and Web Blend.
I only got mine cause of my MVP. but it is so worth it. I have downloaded all the software i can and got all my serials saved up.