"Needed this for a domestic installation in conjunction with 2 normal on/off switches. Gives a smooth control of the power to bring the light on gradually. No buzzing like some dimmer switches with energy saving lamps. Only one issue which was the push action of the on/off sticks a bit, but I'm sure that will ease with time (only reason I gave it 4 stars not 5). Little bit on the pricey side, but MK gives you quality which goes towards compensating that."