I have been trying out Google Chat (no, not the old gchat/gtalk thing) throughout the day, and it seems a bit half-baked. The threaded-conversation concept is nice, but I find it a bit clunky in practice, although maybe that's because I am used to IRC-style rooms with their endless stream of chronological conversation. Also, they really need to let me add people from outside my GSuite organization for this to be useful, and I am surprised the there seems to be no way at all to fine-tune access to a room (e.g., to make it invite-only).