I got sick of quirks with all the other thermostat's I tried and as of a month ago have 8 Gen 2 nest's in my home controlling everything from Radiant floor zones, heat pump zones, heat pump with secondary in-floor radiant, and I love them. They have been very reliable to date, and while I don't have end to end integration with other systems (eg. I can't have a security or lighting event trigger a thermostat change, or vice versa), I am very happy. The UI on both the thermostats and other endpoints (Web Browser, Mynest App on MacOS, ipad/iphone) are great, strikingly simple, yet powerful. I presume automation system developers will eventually write code to integrate with the nest API