Ehh, I didn't understand it either at first. I, unfortunately, bought my MacBook Pro a few months ago. I was looking for a new computer, and I heard these things were just soooo awesome (that was coming from a group of Fanboys), so I decided to give it a try. Had a bunch of problems with it. Nothing hardware related, it was just that the OS kept being weird. After about 8 complete reinstalls over the course of 3 months, it seems to be working like it should. I've been into the hackint0sh business for a while so I already knew how to use OS X.
I prefer Windows 7 over OS X instantly. It's just that, since I'm on a Mac, OS X is sort of exclusive to it, so I do that for all my school work and whatnot. I still have Windows 7 on it for gaming and other things. Also have Ubuntu on here, which is just a novelty at the moment.