Downloaded both this and the Rayman Legends demo last night. I must say, the "Power Off Once Downloads Are Finished" option is quite nice. Started them both before I went to bed, by the time I got up, everything was done and powered down.
Anyways, I've had Sonic Racing Transformed for a week and I love every second of it. Here's to hoping that the demo is good enough to sway more people to pick it up. It's a wonderful game and IMO, more well-rounded than Mario Kart Wii or 7. It's definitely deserving of a purchase. (Also, if more folks pick it up, the online rooms will grow. It's a good night when I can find a room with 4 people in it.)