I agree with tazman. Too many clowns use mechanicals as a crutch for poor tuninga and shooting abillity. I' ve been using rocket mini-blasters for five years and have yet to see one fail. I also think that the blades do close and don' t do secondary cutting damage. The cure is to not rely on this kind of damage and shoot through the beast. Use good heads and enough KE and pass through is common.