I like the ease of the thermostat but not being able to connect to a remote sensor is a problem. The thermostat sits in a hallway and my room has a set of French doors and two windows. Without a remote sensor it does not detect the correct temp in my room, therefore it is either warmer or cooler than it should be.
So this device is anything but smart. It's impossible to connect locally and cloud solution is possible only through some crappy app. There's no way intergrate this device it your smart home using IoT. It has no API and it wouldn't give access to me so that I could access my own devices in order to integrate with my Smart Home, for example, Home Assistant. My advice- avoid it. It might work today, but it's not future proof and it will not work with other your devices.