I never found my Nest to be all that intelligent beyond "I wonder if he'll notice it's colder now?" "Oh wait, he turned me up, I guess he noticed." It's a game of cat and mouse with that darn auto-away enabled sometimes.
I figured as much. Just seems like a big fuss over a whole lot of nothing though if that's all it is. And 3.2 billion for that? Why couldn't Google just make their own that does exactly the same thing? I think its trendiness is all people really care about.