how does it save you money?

I get the whole house sensor concept and the averaging of temps to be more comfortable. I get the follow me concept to make that room more comfortable. But unless you go through and adjust all the dampers how do you save money by running your units more for a specific room which you could do without this. I hope someone has the answer because I would really like to justify one of these.

ecobee3 Smart Wi-Fi Thermostat

ecobee3 Smart Wi-Fi Thermostat

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