I recently had the experience of assisting on the install of a GE Simon 3 security panel. I was seriously amazed at how easy it is to install these and the associated sensors. If you are a residential guy and you aren't upselling these things you should consider it. Sensors have batteries. Screw or stick to trims. Panel needs power and phone. Some simple programming and a call to ADT. Easy money. If I ever start a business I'm going to sell these things for sure.