We have one, the house next-door had a close in lightning strike, it did $7000 in damage, ours had no damage. Think the lightning hit a sign pole at the back of their yard, this was about 150 feet from our house. I will mention the comcast cable failed about 18 months later and in discussion with the tech, he stated that failure may have been due to the strike.
IMHO, these are effective for the close in strikes, they will do nothing for a direct strike. Also, these will not protect EXTERNAL wiring, landscape lights, pool controls, and other wiring that goes outside the house.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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