[RE-wrenches] Surge protector update?

[August Goers]

Wrenches -
 
Anyone have experience with lighning hitting an array with a surge protector installed? What happened?
 
I'm Here's an ad, point number 5 mentions that the surge protectors installed in the array combiner box "protects solar modules and blocking diodes..."
 
http://www.citel.us/dc_surge_protection_overview2.html
 
I'm trying to gather a firm opinion on whether they are a complete waste of $$$ and time or not. Good grounding seems I would guess is the best protection.
 
-August