I dunno, I think this is pretty ingenious! I had a bad fly problem last summer with numerous flies getting into the house somehow, and it got so bad I even went out and bought an indoor zapper to try and kill them. But it took a long time to attract them, and made a horrible cracking noise when they got zapped.
This looks like a much better solution, although the range might be an issue because I have a high vaulted ceiling in my living room.
So far this year, I haven't had any get inside. Probably because I got a pest control guy to come out and spray around the exterior where they were probably getting in around door or window frames. But if I see them start to show up again, I'm buying one of these salt guns and trying shooting them instead.