I have four zones and three geo-thermal exchanger units, all controlled by Honeywell units. Automation interface is via their Redlink module. Works great, literally set-and-forget. Zero hiccups and nicely integrated support for filter change and battery notifications (for outdoor and indoor temp sensors). To be honest, the only thing I need out of the automation interface is home/away mode changes for vacations. Since we have geo-thermal there's a long recovery time. It does little good to try to be overly stingy with on/off modes. Leave it off for too long and it'll take too long to return to a desired temp. That and consume more energy getting there vs just leaving it on a predictable schedule. My point is it's not really about the thermostat alone, it's about the entire system AND your scheduled needs.