If it is anything like the Nest thermostat that I played with a while back, we've learned one thing: TT4N lives on his own. The Nest is fundamentally flawed - it can only track one phone. So I leave the house, and everyone else goes cold. I can't see if this device is the same.
Most of the time, a reasonably intelligent time-switch does the job. If you do something "out of pattern" you just press the "boost" switch.
The biggest problem with all these things is that they work really well .... until they don't. Then you need a phd in computer science to work out what has happened.
Also, as you are finding, the savings are pretty small in comparison to the purchase price....