I've been using vista for many months and it is a great improvement on XP. It won't run succesfully on my office pc, too old and incapable, but it works really well on my video editing machine. (dual boot with XP on two WD raptors)
It'll create the same sort of problems as XP did when it was released, new computers will work well, recent computers will generally be fine after a little tweaking with drivers, old computers, where most people pick up hookey copies of Vista will cause many problems.
It amuses me that some people say they don't like the continual upgrade of winodws and stick to what they like, yet have the latest versions of Ulead software
I run adobe premiere/photoshop, but am still on version 6.5, why? I like the way it works, I know how to use it, it works well on my machine and I don't want to spend another £1,000 to have to learn how to manage new ways of doing things and have the facility of editng highly compressed divx videos which I hate and HD which I won't be buying into until it is more mature
Which is what people are saying about waiting for the Vista SP releases
OK, as a Microsoft MVP I get to beta test from early on, but that means I get to see it improve, and improve by leaps and bounds it has since it first came out to us.
Would I buy it as an upgrade? I suspect not.
Would I be happy to get it on a new machine, yes indeed.
Will I be using it? Yes, but getting it for free is one of the very few perks of MVPdom.