As a user, I like the "fast" part, but I absolutely hate the user experience. I haven't quite figured out how Back works when you're in the "AMP experience", but it's definitely not how it's supposed to work in a browser.
Not if you have opened the article from the carousel (when you can swipe left/right between articles related to the topic you searched for). In that case, Back doesn't bring you back to the previous article - it closes the current article, and brings back the search results page.
