Sense is based on a very clever idea. The packaging and product design are great, installation was smooth, and the iPhone app looks and feels good visually.
Unfortunately, at least in my home, it doesn't provide any meaningful information. Like many large homes, there are dozens of electrical devices in the house, some rather complex (like a furnace), and others dead-simple (like an oven). After more than four months of continuous operation, Sense has identified only a few, with nearly everything else falling into an "always on" bucket, "other," or various unnamed devices, motors, and heaters, not to mention five refrigerators. Sadly, I am no closer to knowing details of my home's energy usage (except the total) than I was before installing Sense.
The execution of the idea is good; I think the idea itself falls short of being practical. I think what's needed is an electrical panel that has individual metering for each circuit, so you can directly gather data on the most power-hungry consumers of electricity.
Bottom Line: No, I would not recommend this to a friend
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