It's noticeably faster but there are a few hiccups I had to deal with - JS needs to be in isolated iframes and getting Disqus comments took a bit of time but in my case the performance benefit outweighs it. At the same time I could just simplified my design without going full AMP and it probably would have been just as quick. The biggest frustration is that if you make any CSS changes it has to rebuild every single page since the style needs to be declared inline rather than as a link to a CSS file.
For those interested: http://dangoldin.com/