My home was built in 1970. Most homes in my area were built in the 70's and 80's. When I rebuild my home I do plan to use PEX. I also want to use the ManaBloc port adapters because that was a damn cool idea whoever came up with it. Then I will just have to worry about chemicals leeching into the water such as MTBE and tert-Butyl alcohol unofficially of course but I don't drink from the well water anyway.