I have a savox 1258 throttle servo, and I found that the ansmann throttle return spring would not move it, i tried the red elastic bands the postman dropped and to get it to move i needed 2 folded in half, 2 folded in half though i though was far too much strain and risked damaging a £50 servo.
I have noted on here people saying receiver batteries can last them 3 months, and they can get servos for £5, maybe if they invested money in decent servos, and changed their battieries every 5 tanks, charged the TX once a week kept the wires neat in the radiobox performed regular maintenance, and kept the throttle linkage running straight, run aways would be a thing of the past?
as for the the RC nitro kill switch it is too complicated in my opinion and just as open to failure as anything else, and is it waterproof? As a gimmick it looks cool though