Honestly, I see it the other way. Those gadgets often add cost and hassle without enough payoff for small ops. I'd rather trust regular checks and proven analog gauges most of the time.
My old neighbor had a sump pump fail last spring. No warning at all. Came home to three inches of water in the finished basement. The cleanup bill was over eight grand. His insurance only covered part of it. Makes a sensor seem pretty cheap after hearing that story.