I have the Honeywell wifi thermostat (without big brother) and it is great. If I’m in bed and don’t like the temperature, I pick up my phone and change it. If I’m away I can adjust the temp so it is right when I return.
I also have a Nest (which is more sophisticated) in a different house, but the Honeywell works much better with heat pumps.
They really do pay for themselves by not heating or cooling an empty home.
Check out post 54. Maybe it's not really that "good."