I’ve been using one in Canada since it launched in February. I’ve enjoyed it quite a bit. Big mix of Reminders, HomeKit and timers via Siri, and more recently really liking AirPlay 2 for music. Mine is in the kitchen, which is open through a large living room where there is an Apple TV. Playing music to both really fills the space nicely.
Coupe things I wish they would improve:
-making phone calls. I frequently attempt to make a phone call via Siri only to be told that it can’t do that. It knows obviously what I’m trying, but I resort to making a call from my phone and then changing the audio device to the HomePod.
-multiple timers. With how frequently this gets discussed / criticized online I’m surprised this hasn’t happened already