I tried the latest MS Flight Simulator on X-Box. It was incredibly difficult to figure out how to set things up to reasonably simulate something like flying an ILS approach. Maybe on the PC it's better, but it just didn't seem to be the focus. And there's background music playing like it's an un-serious video game. X-Plane seems much more oriented towards realistically simulating the tasks involved in actually flying aircraft. Microsoft's seemed more oriented towards having pretty dang spectacular graphics and providing a fun experience for people who aren't really that interested in the rest of the minutiae of piloting aircraft. It's pretty cool that you can see your actual house on the Microsoft one though.