I think the controller is very very poor. Speaking to a friend with a far better understanding of the dark arts of electricity than I have, the reason this is cheap is the motor and especially the controller are poor. When I turn my controller knob even the slightest touch can send it going far too fast, I very carefully set the speed while its empty for a slow spin, then switch off at the wall, put the supers in and switch on. I'm trying to get a proper controller put on mine, but since it fell over when I last used it, its the least of my extractor problems!!