Firstly, it's missing simple, common features that competitors have, such as the ability to run the fan for a specified duration.
The app is kinda crappy, half the time when I launch it, it tells me i have no internet connection, which isn't true. So I have to force close and try again.
And, every time I launched it, it gave me a pop-up that I hadn't granted it location permissions, because it was required for geofencing features. Well I'm not using geofencing features! But i eventually had to cave and grant the privs. So it's a poor ecosystem citizen.
It’s ok. I don’t like that it has no option to set it to automatically switch from heating to cooling. I have an Ecobee thermostat and it is a couple of years older than the T6 and it does that. I had no opportunity to evaluate the thermostats features cause it was an emergency install by an HVAC company and the Honeywell was what they had on their truck.