Sorry about the late posting. Computer problems. We installed the devices. Time saved was at least 60 percent faster than the typical installation. Very user friendley. Although the entire device is plastic with no metal parts I am not entireley pleased with no ground screw on the switch devices. Probably cause I never installed a device without a ground screw. Do they save time? Yes. Would I use them again? Yes. I found the system very user friendley. Good luck out there and please be safe.