I have one. With the Chromecast Integration (Beta) device driver, it works okay. I have sometimes had it not respond, but going to the device page and initializing and refreshing it restores the function. However, those have been quite rare since I put the speaker on an UPS. Also, I reserved an IP address for it in my router so it does not change.
I use it to announce mode change, announce when a contact sensor has been open over 1/2 hour and arming/disarming mainly. I have other announcements that are set, but they would only happen if something like the CO or Smoke alarm went off or an alarm were triggered.
p.s. I have the microphone turned off because I want it for a speaker. I don't want it listening to me. I value my privacy. I got it for no cost because I have been with Google Fi for my phone service and it was an offer that was hard to refuse.
