As you can imagine, down here in the Caribbean electrical storms are quite frequent especially through hurricane season (begining of June till end of October).
I have now lost three or four motherboards, several PSU's and countless modems of my own despite using good quality surge protectors, so that I now make a point of unplugging my machines from both the electrical and phone supply at the first sign of a storm.
For the few years that i worked as a telecom engineer in the UK I know from experience that when a surge protector is killed it doesn't allways cut the service and therefore you don't know that you are running without protection, as stated above most surge protectors are probably useless after their first year of operation and you have no idea that you are not protected because there is no indicator to tell you, that little green "OK" LED is a liar.
I am not complaining mind you, because changing motherboards and modems is what keeps me employed down here.