So I have been using this plugin for a year now. Overall it has been one of the best HG plugins out there. Recently though, more problems have been created than fixed.
All of the bugs I have found have been reported to the thread, most of them are in a post that I posted about three months ago. So far the dev has fixed 1 of them, and added a feature that allows us to make a custom solution for another. I also noticed that there are a lot of bugs that other people are reporting as well. I took advantage of the custom solution and coded my own rollback plugin just for my HG server. It works so much better than advanced rollback. Feel free to check that out on my server; I am willing to make it public (free) for anyone that is having issues with advanced rollback. Just PM me.
I think the dev should work on documentation a bit, preferably a nice wiki with a page for every feature and how to configure it, along with examples. What I would recommend is
https://bitbucket.org/. It allows private projects, with a public wiki and a public issue tracker for that private project. It will help a lot.