Yup, I've used OSX and it's great -- beautiful, fast, and at least as reliable as Windows.

The main problem is, of course, that it's difficult to find compatible hardware or software. That's about the only thing I have against Apples.
I find their ads misleading, not because they say that Apple is great, but because they imply things that aren't quite true -- as Ciber pointed out. Digital cameras "just work" with Apples, but not with PC? I've had a number of customers with digital cameras that weren't compatible with Mac, but worked great with Windows. Likewise, they seem to imply that Macs don't freeze up or crash. I can tell you that that isn't the case.
Like I said, the commercials are very funny. I just don't agree with all of them.