I've use the same Lifereef overflow for the past 5 years on 2 different tanks. No problems at all. Starts and stops 100% without fail (so far) when I unplug my return pump.
The only time I ever had an issue was when a large hermit crab managed to get into the overflow box and plugged the tube trying to take a ride into my sump. My tank overflowed for awhile and when the hermit finally gave up and unplugged itself from the tube, the overflow simply went back to work. I came home to 4 gal of water on the floor, a hermit hanging out in my overflow box, and a perfectly running overflow!
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-Mason
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