When it comes to off-road stuff don't be so quick to dismiss the Mamba controllers. I was always under the impression that because they were not sensored they would have bad low speed characteristics but I recently bought a Mamba sidewinder esc with the 5700 motor for my xxx4 and it is great. I have always been a GTB or RS pro user, I have them in 5 other cars but the mamba esc if set up right operates almost as smooth. I tried it in my pan car and did not like it but in the dirt I like it more because it operates just as nice as the GTB and I don't have to worry about beating one of the expensive controllers to death. Plus the controller only costs $75 new or $135 with the motor.