I haven't had this thermostat long enough to really rate performance although to date, it's working fine. I rated it high because it's so easy to install and connect to the internet.
It is already Returned to the store - it is utter garbage- didn’t work because according to not all Honeywell products connect to all other Honeywell products.
t9 with the single remote sensor is doing a fine job monitoring temperature for a greenhouse application and lets me adjust temperature to suit changing night time situations without making a trip out to the greenhouse.
Thermostat works very well and as advertised. Set up is easy and the internal design is very well thought out and labelled. Features are also smart and well designed. I use the internet connections, but only because I'm behind a secure firewall. If that weren't the case, I wouldn't due to the VERY concerning lack of firmware update options. Any connected device these days should have firmware update options due to security lapses.