I'm installing the lights on a house that has an existing home automation system. The owner has hired the original installer to automate my lighting system. He is using Radio RA and swears by it. This is a rather large property and i'm interested to see how reliable it is. He claims it's better than Lutron's graphic eye which makes me skeptical of his comments. He also said UPB is not much better than x-10 and that it still needs phase couplers to work reliably over time. Everyone has their bias. I can remember one other project that i did where they used Radio RA and it was such a nightmare that they had to convert over to graphic eye within a yr. This property was 2 acres but all the switches were centrally located in the basement under the house and within 75' of all keypads. So long distance really had nothing to do with the failure.