Awesome game, totally worth the purchase price. I'm deeply impressed by the variety they introduced as well, and aside from Stage 4 there aren't really all that many missteps. My thanks to Gregg for mentioning the fact that you get more points by walking: it's done quite a bit for my score!
Unfortunately, if Japan and Europe are anything to go by, I'm pretty sure it'll bomb. Which totally sucks, because I'm loving it more than Galaxy 2 by a fair margin.