Running OS X is a pain on the better laptops I have. So I keep the MBP floating around. It's not actually a bad machine, there's a lot to like about it and I expect nothing to be perfect, but it could be a lot better if it didn't have problems that other machines I had/have just don't have.
In the process of moving over to the desktop now for OS X use, so once I'm fully moved I expect the MBP(s? Haven't decided whether to keep the 17") to get a whole lot less use. Most of the time I take my Sony or Dells (all more stable and usable machines) already, but I must admit I'm a sucker for a pretty piece of technology.