I used a sump pump controller that worked similarly to that USC3. It did not have the fancy probe, but it accepted 2 wires that could be positioned to sense the rising water. When the water contacted the bare tip of the wire (just taped in place in my case), the pump would turn on for a setable time. It worked well for years, and is probably still working. It had 2 outlets. One was for the pump, and the other one went unused. It was controlled by the second wire, and I think it was for an alarm to go off if the water rose to that second probe.
I forget the brand. I bought it at HD. I remember looking later, and they no longer carried it. Maybe there were failures. Maybe something else.
Anyway, that would avoid the float getting stuck worry. That does not mean that there could not be other potential failures.
Edit: Yow... I just saw the price they charge for the USC3. The control I bought was a lot cheaper.