I have two Mamba Max Pro ESCs and they are awesome. My first brushless combo was a Castle Sidewinder / 5700 and it's still in use and works great. I also have the new Sidewinder V2 6900 combo for my son's touring car but haven't run it yet... if it can really handle 40% more power than the original for only $99 for motor and ESC than that makes it unbeatable.