yeah my buddy just got one and put it into his hoss. its nuts on 2s and near uncontrollable on 3s. he has a 54/23 gear ratio. he also has the traxxas talion ext 2.8 tires.
He is gonna try it on 4s when I get him a Y harness for his b-day in April. His is April 22, 2009, and mine is April 29...