Yes, I have raced the B4 too. It is a good buggy too. It needs a few mods to get to its full potential also. The CR is more durable than the B4 in my experience especially when you upgrade to the graphite front arms off the BK2. They are identical to the EA3 arms on the CR just they are made from Losi's graphite. The front arms on the B4 are too weak for my tastes.