I bought a Sense (https://sense.com) because I loved the idea of applying ML to my energy consumption. While the interface is nice, it just hasn't lived up to its promise. It wants to classify 40% of my energy usage as 'unknown'. Nothing so insightful that it's really worth giving up my privacy, unfortunately.
The future of IoT is open, hackable, and decentralized. The IoTaWatt looks like a big step in the right direction.