The fact that the sensors do not come in contact with the water is a definite plus, less maintenance, and should last longer before replacement might be needed. I also like that the firmware can be upgraded, and is fully programmable to meet your specific needs. Feedback options of the unit are great. Standby mode is a nice feature. Easy to read, another plus. Seems like this unit provides everything I would need and want in an auto level controller. Puratek's product line looks well thought-out, with the aquarium enthusiast in mind. "Simplicity in aquarium technology" is definitely for me. And it's made in the USA...yes!