Awesome. It is almost exactly like the PC version. except with less good graphics (of course) and you cant paint your car (D:). But the editor still has alot of of pieces and I found it very easy to use. I just wish they would have worked on multiplayer more. Single card takes a loooong time to download compared to Mario Kart (but the track/cars look way better), and you can only play on 10 courses (Practice and Easy difficultys, so all of them are pretty boring). I haven't tested multi player (my friends are too cheap) but I assume it's like single with more tracks and less download and with desert, rally themes. Post your track pics I guess if you want.
