From firsthand experience: our neighbor had a very close in lightning strike at the rear of their property. We saw, heard, felt at the same time it was that close. They had around $7000 in damages, pool computer, pool pumps, landscape lighting, several GFCI, etc. We have a SECO surge unit, and suffered no apparent damage, however about 18 months later the cable tv feed was bad, Comcast determine the cable had failed probably due to the previous lighting strike.
As noted in another thread, I find these useful, but they do not cover all possible surges, so you need to have surge arrestors on sensitive equipment in your house. Make sure these surge arrestors are UL SURGE PROTECTOR LISTED, and not listed as extension cords, they will cost a little more but are worth it.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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