Funnily enough, the other day I popped into the plumbers merchants and there was a chap with a stall evangelising the Nest products - cameras, thermostats, smoke alarms, ...
We had an "interesting exchange of views" as to the merits of all this "smart" stuff and what happens
when the network is down, why would I want to pass all that information over to a Google owned company, etc. I was able to explain to him why smart meters are being pushed so far (rationing by price management, and if that fails, by rolling disconnects - he was too young to remember the 70s), and how they collect and store far more information than is needed for the job that they do. Clearly, and he realised this, I am not the target market for Nest products
I think the counter chap found it rather interesting to listen to.
At one point the Nest guy said, of information security, that if I were (for example) to setup a new clean email address and use it only to register and use the Nest services - that the fact I'd get no spam would show that things were secure
I carefully explained to him that this was a complete non-sequiteur and security is about far more than just not getting spam to an email address - not collecting what you don't need to is a good start.
I also suggested that having a "best buy" rating from Which? doesn't mean anything. They recently gave a best buy to an IoTat device with known crap security, and in the past (I used to subscribe) I frequently found their reviews in areas I know about to be of "little accuracy or value".