Unfortunately XenForo doesn't provide an official AMP solution, a request so demanded by so many administrators, and Mazzly solved that problem with a very professional work and should be hired by XF to become part of the team along with other notable developers in our XF Community.
I'm a owner of a very big and busy Forum and i can tell by myself my experience with this add-on was perfectly, including the awesome support, basically on real time depending on the problem.
All the bugs, fixes and requests posted on the thread are immediately resolved by the developer. It's literally a real time support. Each user, each problem, each request was treated personally by him, with no complains and a lot of professionalism. Always in good mod and always willing to help. Just check the discussion thread and see by your own eyes.
Since my add on installation is recent, i cannot offer much statistics about it, but the AMP feature is a must have for any kind of site and this apply, of course, to our XenForo platform. Is just a matter of time to search engines do their job (already crawling since day 1) and given my better SEO results. The Bot that come along with the add-on works like a charm, finding and suggesting corrections along the board.
Yes, a must have. And XenForo should implement this as a official solution.