Do I believe in these things? My rig and umbilical house here has a 3Kw Sola ferroresonant line regulator coupled to a 107 lb full isolation transformer.
Lightning protection is provided by a pair of copper bars paralleled .125" apart with a 1-watt 100k resistor connecting the two. The phase is connected to the service drop L1 and the other to earth ground. This provides an enticing ionization path. Only 10-AWG is needed. Everything is soldered together. Lightning steers by ionization feeder leads milliseconds before the main pulse. This circuit has proven itself multiple strike diversions in the high Sierras. The diversion circuits were vaporized.
I can state for a fact my circuits allow sensitive electronics a lot longer lifespan. Some may sneer at a $200 cost for a microwave oven. My microwave costs $600 and I do not have the money to replace it bearing an arrogant attitude. Same for all my electronics.