I had one that worked quite well with a much smaller float, but it never shut off completely and its flow rate wasn't very high so there could be slight fluctuations in water level, but more than I wanted my 2500 gallon fish pond with an area of about 175 square feet. This has more flow volume and switches off completely. The longer lever arm and larger float than smaller devices provide enough upward pressure to fully close the valve. It's not exactly a stepless level adjustment, it's a ratchet, and so far it's been fine getting the water level close enough to where it's within about 1/4 inch of the overflow if I want it to be is that close (I usually allow 1/4). . 2 inches or so). It was easy to install and with thread sealing tape there were no leaks. It looks well made and I hope that if there are no accidents it will last for many years as smaller models do. I would buy this again if needed.
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