4.5 really. Other than original one not working, this is a fine smart thermostat. I liked the Nest more that I had in my previous home only because of aesthetic reasons and the app for Honeywell starts up all jittery before allowing me to fingerprint my way into the app. Otherwise works well for what it's supposed to be used for.
As with all IOT devices, security was clearly an afterthought with this thermostat. Anyone in the world can access my thermostat if they guess my username or password. There's no option for 2FA, and no notification when a new device logs in. For those without an imagination, this is bad.
I wish my vendor had installed a regular thermostat. If I ever buy a Honeywell product again, it will NOT be Internet-connected.