How are you Nest owners liking your thermostats?

I'll be moving soon, and would love to put a couple of these in. One to replace the main thermostat, and the other to place in the bedroom for proper climate control at night.

My main curiosity is the learning feature. I'm curious, because I'm skeptical that it could ever learn in a household like mine. My wife and I have ideal temperatures that are about 6 degrees apart, so we constantly want different temps. But even more relevantly, I simply do not have a normal schedule. I am never in or out of the house at the same time every weekday. Do you have any idea how the Next would adapt to me?

And lastly, can you turn the learning feature off entirely?