The system works well. Just hard to see the screen when adjusting the temperature. Had nest system before and it was easier to see due to screen contrast and I believe size.
Thermostat seems to be working properly. I would say that it is not as "user" friendly as the Nest however. It was a little more difficult to get wifi started and to share the interface with other family members.
I would have given 5 stars but there was no 'instruction manual' that came with the thermostats describing all the functions available and the 'how to' set it up. They came with a very small 'booklet' explaining 'getting started, 'how to connect', and how to use' (6 more pages of the same instructions in French and Spanish). I know I could probably go online for a manual but I'm one of those old folks who likes to have a manual in hand for ease of reference. For my boiler system I needed 7 thermostats and they weren't cheap. The thermostats work great on wifi (controlled on the app on my phone) as advertised. It gives me a great level of comfort while on vacation out of state knowing the boiler is functioning as it should. It is very easy to adjust the temps at the thermostat or on my phone app in Hawaii. I like that. I just wish it came with a manual to explore the other functions the thermostats have to offer. I would recommend this brand of thermostat, just ask for a manual. My plumber installed all the thermostats and he seemed to have no problems.