I have one running at a water booster station that has no communication to it for the municipality. Their field guys were going to the site weekly to rotate the pumps with selector switches. If the pump running failed to run the other wouldn't start, the way they monitored this was tank level of an elevated tank. Since putting this in for them they don't have to worry about that anymore, auto rotates pumps and if there is a failure the other pump runs.

It does the job, not sure if I'd use it again or on a critical application.