I have been using the x-10 modules for lighting for a couple of years, for my house and for the fishtank. When they work they work pretty well. However, they do not always work. Our house is pretty new, 6 years, so the wiring is not that old. But quite frequently it misses turning the light's on or off so I have to do it manually. I replaced the batteries in the main control module, and it still frequently resets the date and time to some random number. I would not recommend it for anything that could cause flooding, like a pump, and only for lights if it's ok with you if they do not come on or fail to go off occasionally. I tried calling their tech support which was absolutely worthless, I would say among the worst that I have ever delt with.