This is a great thermostat for our in-floor hydronic heating system. We have 3 zones so I bought 3 of these. Installation was simple. I used the 7-day programming mode which was very intuitive. After several weeks, they are all working flawlessly. Changing the programming is easy. The way they are working has to result in some significant savings in our seasonal heating costs here in MN. In short, I can't think of anything I don't like about these thermostats.