I have been less than impressed with my MK Max 70# variable. There is a mag switch that you push a magnet down to with the button. The actual switch/sensor, is not anchored in there very well. I've had to work on my less than a year old motor several times. I'd go MG again if I was making that decision today. Piss poor design. I've also bent/broken a few blade pins, they are soft.