If I lived in tornado alley, or along the south/east coast where I'm boarding up the windows against hurricanes on a regular basis, I'd install them no questions asked (at least, now that I know about them). But they're a little overkill for this area.

Our back yard is shaded by 6 rather large douglas fir trees, which mostly shade the back windows, too. If one of them topples over in a windstorm or earthquake, those durable external metal shades doubling as security shutters aren't going to help much more than having tinfoil taped to the window.