I have been an X10 fan now for about 20 years and have enjoyed the convenience very much. Granted, I have had problems but have acquired enough troubleshooting experience to deal with whatever issue pops up - and most of the issues have been my fault, not the X10 equipment. I live in a modest house on the Big Island of Hawai'i and would characterize my X10 system as relatively complex - a true X10-wired home. This includes a security system with four cameras including the professional pan/tilt XC21A, contact and moition detection alarms and over 35 modules, all controlled by Active Home Pro on my laptop. Oh, I've had the usual interference issues, inoperative modules, phase problem, etc. all of which I carefully worked through and solved by myself. I even use Vanguard and Active Home Remote My House on the internet which can be slow at times but generally works great. I think the biggest problem I have had is the door/window sensors in the security system which occasionally malfunction. They are cheap enough to just replace - the postage being more to return the defective units. Overall, the price for individual units and those that are on sale frequently is extremely reasonable. The most expense item I have in my system is the Pro Pan/Tilt Camera for which I paid $499 and is now being offered at $299. It was worth $499 in my opinion. I have demonstrated my system to many neighbors and visitors most of whom now have X10 equipment themselves. My recommendation, whenever you have a problem, is to carefully and logically go over the entire system asking yourself what changes on additions you have made in your house since the last time the system was working fine. Yes, 2.4 ghz telephones play havoc with the security system, and that's why I switched to 5.8 ghz telephones. I suddenly noticed about five light fixtures that stopped responding to X10 commands and narrowed it down to the battery charger in a new Black and Decker portable drill I had just purchased. Well, a filter solved the problem with that (I use about 6 other filters in the house to eliminate problems). So, am I happy with X10. Yes, I am very happy with it. It's cheap, fun to use, and very convenient. Folks, just be patient and take a logical look at your system whenever you have problems. Nothing's perfect in life you know! Aloha!