I picked this up based on Jeff's excitement on the BombCast and love it.
This is the first Trackmania game I've ever purchased, but it suits my style of play perfectly. It's, as the official review describes, less about "racing" and more about the "perfect run". Having no collision with other cars means that it all comes down to your skill and precision, rather than trying to deal with other players.
Highly recommended for anyone who enjoys racing games, or even just trying to nail that one perfect run.