Great testimonial. :B
I experience power source anomalies several times each camping season and find my Progressive EMS-HW30C disconnecting anytime such an event occurs and as a result have never had any failures within the trailer itself since I began using it. Prior to that I did lose the microwave oven in our previous KZ Spree and did have to buy a new one. I also plug in full time here at the house but last year service suffered an excessive voltage drop on one incoming leg and excessive voltage increase on the other. The camper happened to be plugged into the low leg so my EMS disconnected immediately - no harm, no foul. Unfortunately the television in our living room was running on the high leg and as it wasn't protected by any form of surge protection it blew the power supply. Fortunately I found a replacement online and repaired it myself, avoiding having to replace the television itself. Unfortunately, my iMac downstairs wasn't so lucky - the little plug in surge protector was blown to smithereens and the duplex receptacle badly charred. I replaced both and managed to get the iMac going again but the video card, which is now out of production and no longer available, never did work correctly again and finally gave up the ghost, so I had to replace the iMac with the MacBook Pro I'm now using. Expensive lesson, and while an RV specific surge protector / EMS may not be a total guarantee against any and all occurrences it sure is a lot better than doing nothing at all to protect the electrical system in one's rig. I'm sold, and like you would never plug in anywhere without one.