I'm convinced after reading about the damaged items without one. I just purchased the P.I., but I will purchase Franks if I lose power often due to low voltage. We're seasonal in one spot, so it's going to be a Yes or No. Both brands will shut off your power for surges or low power, but Franks goes the extra mile to juice you up in low power so your stuff keeps running, like a/c. That's my understanding.
I already purchased the PI unit when I learned more about Franks. Either way, good investment.