The thermostat itself is fine, but trying to synchronize with the app over wifi is a nightmare. Also they want you to install a screen lock on your phone in order to use the app, which is crazy. So I'm not using the app.
I wrote a 4 stars because the second day my thermostat stop working with an error(can’t remember what error it was) so I shut down my furnace completely and when I turned it back on the error was gone but I was a bit stressed out with no heat in winter time