CNC tail head set will give you crispier responses, of course you have to go for CopterX head or any other Trex style head. Belt-Cp CNC head is a waste of money to invest on. I upgraded my tail to CNC only because the little knob in the plastic tail box wear out on me too fast, performance wise, I don't see a difference. If you really want to blink up your heli, carbon fiber paddle and tail fin/blade is worth it cuz these things rarely break and not that expensive, performance wise, again I don't feel any difference.