Works as advertised. It's nice to have the inside temperature for my top floor to help the HVAC system do a better weighted average and control the temperature. It was easy to connect with just 3 wires and only took about 15 seconds to register the temperature once the system was secured. I think time will tell if that helps. All in all, it does its job of remotely removing the temperature in another room from the thermostat. Cons: No wall anchors included. No big deal, because that's what the most comfortable people have.