Nest thermostats or any smart thermostat

Is anyone interested in sharing their results, observations, problem-solving, etc. with Nest or any smart thermostat?

I have five (Nest) for heat/air. I have had ups and downs with them. I think I finally have turned the corner with them. They seem to work well. From two years ago to last heating season, I went down 22% in oil usage. For air, I went down about $35 in electric per month.

Is anyone else seeing savings?