I use the sidewinder in The Saint, the robot is rubbish, but the speed controller is very good! Running Bosch motors at 24 volts with hawkers. Because I€™m new to this I don€™t know how good or bad the other speed controllers are. At the moment I can€™t see why I should change for a heavier and more expensive unit. I have had in combat, a situation when the wheel jammed and the motor got too hot to touch but the sidewinder was un-affected.