I've been using the self hosted version with a 10-person team for a year now and so far we like it. It's not as good as Slack (yet), but if you need to self-host, I can absolutely recommend it.
Do you have any wishes for improving Mattermost for your team?
Integration with Google Meet, Zoom would really help.
I see plugins for both but could never get them to work (teams edition though)
The expectation is that, just like on slack, I should be able to do a slash command and have a Google Meet or Zoom meeting ready to join