Interesting topic. I just purchased some Z-Wave devices to play around with. My house is all Insteon - every switch in the house. It is extremely reliable in function. What sent me looking at Z-Wave is two things. First, because I see questions about Insteon survival, but what really pushed me was the failure rate of the hardware. I have replaced a lot of these switches over the years - they just start malfunctioning at some point and it's annoying to keep having to replace them. They have gotten better though. I just set a Z-Wave range extender on each floor and set up a couple of lamp dimmer plug-in modules, and I have some switches to try. The couple I have in now are working fine, but not as responsive as Insteon, and not as elegant. Now I'm not sure if I should just continue buying Insteon, or keep digging into Z-Wave some more. As someone here mentioned - it's expensive and time consuming. Don't want to bet on the wrong horse.