I had a Nest early since I preordered it. Unfortunately it just died so I'm not the happiest person. But, over the 1.5 years I had it I saved about 3% from pre

I had a Nest early since I preordered it. Unfortunately it just died so I'm not the happiest person. But, over the 1.5 years I had it I saved about 3% from previous years with a dumb thermostat. This doesn't recoup the cost at all. One reason the savings was so low was that the firmware on the Nest was very inadequate during the 1st year. It didn't even do automatic heating/cooling on a schedule. All that was resolved last year. The other reason is that the Home/Away detection is worthless for me (and I suspect many folks) because the thermostat location isn't in the traffic pattern of the house. I've pleaded with them to do a remote sensor but so far they don't care. Most of the new modern wireless system have the ability to add remote sensors so they're being left behind quickly. Even so I'm not disappointed in the Nest. It's cool and I am very pleased to have wireless access via my smartphone to the temperature settings. But they need to do a lot a work to get back to the level of companies like Honeywell and their distributed system.