I was given a Google Home Mini as a Christmas gift (the resident tech god for most people's lives doesn't have one? what, how can this be!? someone rectified that for me), and I've been toying with it... and its the Google assistant in my phone, but in a stand alone device.
I mean, don't get me wrong, that's a lot more useful than people realize because.... IT ACTUALLY WORKS. Ridiculously loud kitchen fan hood roaring along at levels that are probably considered unsafe by OSHA standards? "Hey Google, do the thing." "Okay, I'm doing the thing." Upstairs, far away from it? Not even yelling at it, it understands me reasonably and does things alarmingly often.
The best impossible magic? "Okay Google, turn my television off." My Chromecast is not named "television" nor "my television", is only referenced in my Home config as the default TV for that room (of which the TV and Mini share), and somehow turns the TV off even though the Chromecast does not expose this functionality anywhere in the Home app (and was assumed to only know how to issue exactly one HDMI CEC command (turn TV on and switch input to here) due to some undocumented and strange hardware issue... hundreds of threads across the Internet all about how can they turn the TV off even though they can turn the TV on, none of them ever figuring out how to issue CEC off or even if the Chromecast can... it can, and the assistant in my tiny speakers knows how to issue this probably undocumented command to the Chromecast).
My experience with Alexa? Ideal listening conditions, no background noise, only me talking. "Alexa, do the skill that you know how to do and is advertised in the commercials on TV, any off them." "I'm not quite sure how to help you with that".