I do have experience in Vista. I was running it for some time. Even still have it on my virtual machine. I am not just joining the anti-hype. Also my machine has no problem running Ultimate, and this on a virtual machine 
I dont like the interface, i dont like the coding, i think it wastes resources, it can not do much more than my XP, but uses up much more resources. And a lot of apps i was using for work happen to fail under Vista. Also simply the fact that they give you desktop enchantments only with ultimate is a marketing strategy that makes me even more dislike it. Stuff like this should be provided with the standards, and real application stuff can be added to higher version. But despite this, i just think its a bad OS, and it is overpriced.