This is really brilliant, and lifts the game for Chat in Discourse significantly. Well done Lindsey and the dev team who have put so much into it!
It now allows users to manage their own heavily notified chat ‘groups’ without admin involvement; this is a real game-changer in my books and opens up all sorts of use-cases.
One little thing that I remain tripped up on is the user setting only_send_chat_push_notifications. I’d better put in a feature request for this: