I've got a Leviton 4 switch controller that has replaced one of the light switches in my master bedroom, (and another one elsewhere too). They function at about 95% success in controlling various lights around the house. I've got the CM11A, that works about 75% of the time carrying out it's tasks, and the CM15A works about 50% of the time...I've tried couplers/ repeaters, signal boosters, noise filters, changing outlets..leaving computer on, off etc...My guess is the Leviton puts out a stronger or better quality signal than the CM15A, but if the system was robust, I shouldn't need to mess with it every time I put in a flourescent buld, LED night light or new TV...I don't doubt some people have systems working great, but I suspect anyone who have a large number of devices in a good sized home had to spend a fair amount of time getting it up and running reliably. That's why I feel this stuff may be great for the hobbiest, but not for someone who never learned to program their VCR...