Thanks - is there a link to there info for background reading too?
Yes, think the sheer volume of detail could be a barrier for many new users - particularly with Flex Schedules - yet that is really why I think most people buy Rachio. So think several things could be done to help simplify the learning curve, pulling articles together, etc. Several ideas how to help this - think would go a long way to more adoption.
Just by its absence, not seeing Efficiency mentioned just leaves questions - yet your explanation cleared it right up plus the link to it if still needed - which I think I do now for two zones.