A good idea, but poorly executed.

Plastic is too brittle. The supplied plastic screws are the wrong size for a standard rocker switch. If you use the original screws, which I found that you have to do, you need to tighten them very carefully and leave them looser than you normally would. Luckily, I thought it was one per package and got two packs. On the first one the plastic screw broke off way before it was tight against the guard. When I tried the original screws the guard cracked before the screw was very tight. Even being more careful, the second one cracked as well.

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