Mmm; that's fair. The husband had an XPS 13 (not sure if that old, though; it was the one where you could get the cover in Rose Gold) but they only use Windows so I can't say. I've mostly installed Linux (for myself) on Latitudes.

Oh, for sure; it is definitely impressive. I dunno if you already know (so, basically, I apologize if so!) but part of how Apple's able to pull that off is they manufacturer their own hardware and only install to it; so OS X's optimized to the hardware in a way Windows and Linux can't be (since they're designed to run on any hardware). I'm sure that's not all of it but it's part of it.