Inbox size limit user group permission, participant groups, autoresponders, selecting multiple conversations for inline edits, last message preview...
OK, I'm not even going to try and list all the useful features of Conversational Essentials.
If I were to ever create another XF forum, Conversation Essentials alongside a selection of other add-ons by Xon would be my first pick.
It's amazing that this add-on has had three (?) owners over the years, first Syndol, then Daniel Hood, and now Xon.
Xon has been by far the best of the bunch. We're in good hands :)