[captain harlock]

What was the cause behind the distruction of your ESC? such questions should be answered first. If your -missing around- with the controller is the cause then you should be more gentle with electronics since they are very sensitive and you might fry even the most technologically advanced controllers in the markets if you do not be extra careful. The 9920 and the 9L are perfectly matched and there should be no problem in running them except that if you have over geared your machine , added more cells than what the 9L cane handle with the same gear ratio , you did not make the air flow reach the controller appropiatly or you might have reversed the connections between the controller and the batteries. Believe me the 9920 is great specially when it comes to monster trucks and off road machines you wont go wrong with this system.