I just checked my bills and I also did compare previous years
and find out that between 2x ecobees3 and this Smartthings integration
I saved over $500 this year on cooling/heating in the 3000sqf house already pretty efficient before installing MyEcobee.
I Contributed donation before it was mandatory and I decided to contribute again today.
This integration will bring your money back.
Also during last year it never disconnected unlike many of mine sensors and other devices.