For some people, the answer is yes. If you do a lot of traveling or are out for many hours during the day, it may be worth your money to invest in one of these devices. You could save a lot, especially if you forget to adjust it when you leave for work or go out of town for the weekend.
You won’t have to worry about whether your smart thermostat is on the right program, or if you remembered to change the temperature setting before you went out. It doesn’t require much effort from you, but you’ll see it in lower energy bills.