I find it a very useful tool to share meeting notes with customers. The tool makes me disciplined about capturing notes. My customers appreciate the professionalism, and love the neatly formatted notes and action items.
It works best with recurring meetings. Meetnotes automatically figures shows action items from the previous meetings in the series. This makes it easy to go around the room and ask for updates from last time round.
The slack edition now makes it easy to do all this from within slack, so it's a great plus