I received a review copy for my site, and I'm digging the game so far. Time trials are absolutely way too easy, but the races are a lot of fun against the AI. Sadly, no online play, which stinks because that would have been awesome. So would sharing custom-made tracks. I've yet to try my hand at making one yet, so I can't go into how much detail there is, but as soon as I do, I'll dish.
The one thing that I don't care for is how small and narrow the text is. It's very hard to read if you don't have a huge TV.
Thanks! How are the controls? Some people seem iffy on them.