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[Aqua-Digital]

Just simply to answer the questions.

The unit has one sensor but has a fail safe shut off. If the unit sees that the level has not reached on a 20x cycle it will shut down. This I believe keeps the cost down for two sensors

[Seth81]

Pros:
No level switches that will fail in short order
Alarm concept

Cons:
Mounting arm for sensor doesn't look like it would work in my sump
I think the sensor is normally submersed in the water, so salt creep and eventual failure.
Alarm can not be configured
Pump doesn't look like it would work for me as my fresh water tank is far from my sump

Instead of solenoid option, I would personally like to see a dry contact rated for 1A @ 120 VAC

Just my 2 cents