Just a warning. These have been known to actively seek out and assassinate your router. I wish I was joking. I mean, it's still kinda funny, but also they spy on you and send your info back to google. Which is less funny. Unless your version of humor is uncomfortably specific advertising every time you go on the internet.
In all seriousness, putting one of these in your home means that google now has a microphone in your house that is always on, and that they have as much or more control over than you. Google has lied about their data collection many times before, and I am sure they will be caught lying about it again.