I hate it.
With that being said, let me explain a little. I now have Vista Business installed on my computer at work. I decided to give UAC one more chance, not sure why, but I did.
After having to respond to several prompts just to delete an icon, I realized that UAC has not changed since Beta 2. It's is poorly implemented and, in my opinion, sucks.
Microsoft is now touting that UAC is not a security feature. Well if it's not a security feature, what is it?
Read more here.