The Nest thermostat is actually easy to use and the convenience factor far outweighs any perceived complexity. Early adopters didn't buy this because of the unp

The Nest thermostat is actually easy to use and the convenience factor far outweighs any perceived complexity. Early adopters didn't buy this because of the unproven (at the time) energy efficiency features, they bought it because of the design, the improved UX/UI and the fact that they could could change the temperature without getting out of bed. The more the mass market is exposed to this tech through interaction with early adopters, the sooner adoption will pick up. Also replacing legacy devices, especially thermostats and smoke detectors, is not at the forefront of the average consumer's mind. I think cost plays a much bigger role in the adoption of these devices than complexity and usability. Nest products are not cheap but as they continue to build out (or acquire) their ecosystem their value proposition will increase and mass market adoption will start to take off.