We would all want to lessen the chemicals we use in our homes so I was thinking of buying a Riddex plus pest repellant. The issue is the reviews are so mixed I'm not sure if I should buy one. First off some say it works but others say its a total failure. Still some claim that it only works in new houses because the electric wiring is better compared to old houses. It works supposedly on electric pulses that drive pests away. What has been your experience with this device?