The T6 is great when is works. However it loses connectivity too often. Hold times for tech support are 30-40 minutes. Would like the WiFi function to be more stable.
It did take a few tries to get the app to work, but once it connected to the two thermostats it has been great. The app is easy to use and controls both of our thermostats superbly. This is so much easier to use than our system at out last house.