This isn't the exact unit, but does anybody have experiece with this type of pest control? I was interested in using a few of these in and around the house. We have a finished basement, but it's a walk-out and the spiders like to collect around the door leading to the yard. Also, we have front and back porches that I'd like to keep the bugs away from. Mainly, I'd like to know if they even work at all. Thanks, guys!!!