I have the Progressive EMS-PT50C and won't hook up to shore power anywhere without it. At my home base last year the EMS-PT50C shut off my power due to high voltage. I don't mean a voltage spike, I mean high voltage for an extended period above 132 volts. A transformer was failing in my area and there are 9 s&b's on the same transformer. All of them saw the high voltage too or maybe I should say they experienced it, but didn't even know it.
I used my generator while the power company came out and verified I was right and changed the offending transformer. Two of my neighbors did ask me what was happening since the power company came to my lot first.
2006 GMC 2500HD CCSB 4x4 Duramax/Allison, Titan 52 gallon fuel tank, Prodigy Controller, B&W Companion Hitch
2010 Jayco Designer 35RLTS, Cummins/Onan RV QG 5500 EVAP, Progressive Industries EMS-PT50C, TST Systems 507 TPMS, RV Flex Armor Roof