We had some initial issues setting up the Wifi during the installation. There could be clearer instructions providing the details in connecting the thermostat to the home Wifi. We have experienced any issues once the network connections were setup properly.
Better than typical thermostats but it has real trouble working with HomeKit, esp. if your wifi shares same SSID and password between both 2.4 and 5Ghz networks.
We have 2 of these -- upstairs and down. One works fine, one does not: Glitchy and difficult to set up with WiFi..It walks you through it just fine, indicates "success", and next day isn't working. The problem is not my wifi; I have a other smart devices on Apple Ihome that work just fine. And screen defaults to "register online to see outside temperature". However the registration process does not distinguish what particular thermostat it is (serial number or other ID). Seems that the registration process is merely a way to capture your email address.