I don’t know how long you’ve been under ST, but I can tell you that you don’t want to exclusively rely on the ST scheduling for heating/cooling your home because of past issues with the scheduler. It’s better now, but the issue has been recurring from time to time. I live on the East Coast, and I’m glad to have a smart thermostat like Ecobee. Especially when paired with My Ecobee device due to its reliability.
If you rely on a dumb z-wave thermostat as your main thermostat, then you should read the followng threads: