I loaded up vista yesterday. So far it's working pretty well. Aero is nice. And the macbook pro can handle all the bells and whistles. I haven't done any serious work on it, but so far it's pretty. I could see switching my work computer to be vista in the next month or two. Once I can verify that all my apps will work.
I still have a slight preference for OS X at this point, although I'm more anxious waiting for Leopard. OS X is old and grey... Vista is new and shiny.