Hi. We don’t have rich text writing enabled right now, but we are planning to add it, there are plugins from ShareDB to Quill for rich text. To me what is great about ShareDB is that we’re using the json type very extensively for collaboration in rich activities - so it’s much more than just collaborative editing (collaborative voting, ranking, concept maps etc).
The one thing I could never figure out is how to piggyback on the Meteor websockets, so we set up a second websocket connection (which does lead to some complications with mup etc, but nothing we can’t solve). However, there is no problem with reusing the same Mongo server, and we also run the ShareDB code within the Meteor process (only a few lines to add a SharedB listener).
I think it would have been a great idea for Meteor to integrate something like this in the core, because it’s fantastically useful, and the backend is anyway Mongo documents, but I guess it will never happen, and in the meantime, we manage quite well.