I have one HS110 (on our fridge, working well), and seeing them for $16 a piece today (HS110s are cheaper at Walmart ($15.99)), I am considering getting several for key appliances that may be hard to identify as they have multiple components inside (dishwasher, washing machine) and also for others where monitoring over time would be useful for safety (radon fan, a couple of warm wires around water pipes in a non-insulated crawl space). Perhaps some others.
One concern is how much load having these linked into Sense will put on the Wifi. There are various articles that mention that 20-30 devices on a home Wifi can start to create problems, and we are probably already there because I get more HS110s.
To sense: how often does Sense query these plugs, and could this lead to congestion on the network? (Does having them integrated in Sense lead to more traffic that they would have stand-alone?)