I got it when it first came out (like a month ago). The game is alright. It was $20 because it isn't very polished. The music sounds even more "canned" than in TXR Zero. It's kind of nice that they have licensed cars in this game, but it isn't enough to make it a full new experience.
It was worth $20, but not much more than that. It's fun, but Project Gotham Racing 2 is MUCH better.