It is working great. It's nice to hear it bump up when the engine is working hard and then automatically slow down. Most of the time I it just blows half speed or less. And I expect a lot out of it because I get pissed if I go above 180. I have a 160 degree thermostat and my avg temp is 170-175. I'm running a 493 with A/C that is driven mostly on the street so I wanted the best system I could afford. And this $200 radiator and $100 Mercedes fan fit the bill. Although the controller was an unexpected expense it was worth it.