I had no issues getting the unit to connect to the wifi, no problems with the app, or controlling anything. I only wish it had a slightly bigger footprint to cover holes from old stat.
I installed three of these thermostats in my home. They are easy to program and read. I love that not only can I program them remotely, I can also use my Amazon Echo to set the programing or make a modification to the temperature setting. The colors are vivid and I was able to choose a color combination that goes well with my decor.