I have been shockingly surprised. I have a small 3-bedroom condo (just under 1,100 square feet). I put the Google Home in my kitchen on the counter that juts out a little bit into the dining area (not quite a seating counter but great place to drop keys, purse etc.). GH can hear me from everywhere. I can command it from my office which is probably the furthest away... Even when sitting at my computer facing away from the speaker. I can command it while lying in bed but I can't hear its responses too well. Which is fine because I'm usually just turning off lights. I am concerned, however that I can probably initiate it from OUTSIDE my condo entry door. It's closer to that door than my office and it's not a soundproof door. I wouldn't care if I could set it up to only recognize my voice (like on my phone). I'm in a secure building so am not overly concerned but they definitely need to do something w voice recognition. Voice recognition might also be a good way for multi user households to be able to transition from one account to another. Guest mode could be used for when you want someone else to be able to play with it.
ETA I do have to raise my voice but I don't have to yell.