tatooedtrackmen, It is hard to tell what is sufficient since lightning can have different forms. Nothing will protect against direct hit and everything else depends on the distance and location. More protection is always better. I decided to get circuit breaker type because I don't have enough space in my panel to put more circuit breakers. They recommend for protection device very short connection to a circuit breaker with no pig-tails. Since it is against the code to connect two wires to the same breaker (without pig-tailing) I would need two extra 20A circuit breakers and I don't have space for it. Perhaps one day I will get electrician to install extra panel and add more surge protection.