We have installed GFI receoptacle and breakers on behest of a customer last year who insisted they would prevent harmful surges. I gladly took his money at the time. He called the otherday to thank me for ajob welldone. His house had got hit by lightning and nothing electrical toasted, every GFI tripped, one needed to be replaced. I originally entered this situation with extreme skeptism, I think I'm sold now. Are GFI's a proven surge protector?