I got a JBJ direct from them for fairly cheap. The unit itself works great. My only complaint was that I wasn't able to use it with the TOM aquilifter that I purchased specifically for top off.
The JBJ unit would trigger the aquilfter to come on and it would start to pump water, but for some reason the JBJ would "time out" and cut power to the pump even though the float sensor was still too low and giving the "pump on" signal to the head unit. Once the JBJ unit would do this once, it also would not be able to turn on again since the head unit thought that it was still pumping water, even though it was not. I spoke to another hobbyist who also had the exact same issue with his JBJ unit and an aquilifter pump.
In the end, both of us ended up using a small powerhead instead to deliver the water to the tank and it has worked great ever since.
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