They are EXCELLENT race only wheels. I just bought a set of Crosstrails, wish I spent the extra $$ on the Crossmax wheels though! I love these wheels! I lost nearly a 1/4 lb on the rear wheel alone! And in the repair stand the spin goes on forever..... They will stay true for a long time due to the spoke arrangement.
By the way, they don't have to be race only - they are great XC wheels also so good for those training rides as well.