I have already replaced all of my .v35 dimmers and relays but not KPLs because it is my understanding they aren't causing problems. The access points are correctly coupling the two legs. Two dual-band devices also couple across the legs. My wireless devices work fine. I don't believe my 900 Mhz phone is interfering with them. I have a passive coupler installed at the dryer left over from my x10 days. I have an electric dryer and water heater on 220v. All of my Comfort Cove heaters for the house are 220v. There are eleven zones of these each on their own breaker. I have numerous filters (again left over from x10 on electronic power supplies, TVs, stereo equipment, etc. So, I suppose there can still be noise issues but another question I have is how many devices will fire out of a scene reliably--unlimited, 100, 25, 10, what? The two scenes in question turn off all downstairs devices and buttons, and the other turns off all devices and buttons. The first has 95 devices and buttons the other 158. Is this too many to handle?