Quality of any type of lightening protection varies widely. I've taken few a part. Just a couple of MOV, MOV with inductor, and nothing at all. Coaxial type tends to depend on spark gap. By the time enough voltage builds up to jump the gap, the equipment is toast. By the way, MOV is no match for lightening induced transients. Some of them do good job against other appliances generating spikes.
Yes, I've lost few things to lightening. At a different location, I lost half of an apartment full of appliances. At this location, few network ports, gateways, etc. Electrical power source is fairly robust. I have layers of protection, and in this area, wires are underground. Somehow, cable TV infrastructures are rather susceptible. That may change when fiber optic spreads to my area.
Either way, I don't want to depend others doing the right thing. I do want my own protection which I can trust. I have a lot more to lose. Lab full of equipment and over a dozen computers all networked together.
I forgot about Polyphaser. They are quite expensive but their reputation is next to none. Thank you for suggestion. Problem with this type though is ground connection. Good ground is on the other side of house, and code calls for ground entrance be done at one location only. To be effective, Polyphaser needs to be installed close to my modem with short low impedance ground. I'll figure this out. There got to be a way.