I got mine a month ago and love it. It was a huge performance upgrade over my old desktop, and I've been blown away with how "good" the OS feels.
I put Vista on it also with Boot Camp, just to see what it was like, and while the GUI graphical stuff is slick also, the OS just seems so loose and sloppy compared to OSX. Secondly, all the programs I used on Windows are all available for OSX, except for Trillian, which Adium replaces quite nicely.
You won't regret the purchase
