My separated wife has one of these in her flat. I have only been there once and avoided talking about our relationship. I would absolutely not have such a thing in my house. I have denied the Google App permission to access the microphone on my Android phone because the idea of having something constantly listening creeps me out.
I would in effect do the same to Siri if I had an iPhone. When I upgraded to Sierra on this laptop I was offered Siri on setup but declined. I have so many people from decades in my address book and the idea of handing them over to a service gives me the horrors as does curating them in some way first.
Just like one thing which helped keep me of Fb for so long was tales of address books being raped and 'Hey I'm on Fb' messages sent to everybody on them when the App is installed horrified me. The privacy people surrender unthinking for 'services' just appals me.