I put in a 200amp unit for my whole house. It definitely works. I've never blown a power strip/fuse/surge protector since. The unit cost about $400 and took the electrician 1/2 day to install. It's worth it.
It still will not prevent spike within each circuit. You will still want a line conditioner for your system to clean up the little stuff.
It still will not prevent spike within each circuit. You will still want a line conditioner for your system to clean up the little stuff.