Big fans of the liveloop guys, great to see other people tackling the problem. For us we're trying to make UX our key differentiator, and keep things as simple as possible. Also, we're doing slide by slide version control, rather than the snapshots of the whole file, which a few other companies in the space go for. One other interesting thing to note, is that when we were doing usability testing, people seemed to prefer the idea of new drafts of a slide rather than pure realtime. It seemed to suit the way they currently worked rather than, realtime. This surprised us.

Interesting, that surprises me as well. Thanks for sharing!