I enabled it on https://www.gitignore.io a few months ago because it suggested that it would improve my mobile users experience. After posts like these, I think it's time to take it back down.
Only an anecdote, but AMP trashes my mobile experience. Using Chrome on Android (so it ought to be good...) it rewrites back-button functionality, so that even after I've changed through 5 different pages, a single 'back' press takes me all the way off the site to Google search results. It also eats a bunch of screen real estate with the AMP bar for longer than the normal address bar.
