Summary: Do NOT buy this version. The game no longer supports Games For Windows Live. You will not be able to save any progress. Also you must use the disc to play the game. There is no option for a full installation. I ended buying the Steam version which was a much better choice.
Summary: As someone who had been playing Gran Turismo since the 3rd on PS2 as a kid this made me rethink Racing games in general. I've never played the DiRT series before I plan to try the second one at some point, but this one blew me away at the start.