Been keeping tabs on Autoptimize ever since I gave it a 2star review a couple of years ago.
Re-tried it again many times, blew up websites many times, and to be honest, I couldn't work out what all the fuss was about. There was no clear documentation and minimal settings to adjust, and I'd given up on it.
Then I enrolled in one of these online Udemy courses. When I saw that it involved using Autoptimize, I was a knife-edge away from asking for a refund!
Having followed some excellent coaching and teaching, I can now see where a lot of the acclaim was coming from. Infinitely better at minifying than W3 Total Cache, when the instructions are there to use it at full throttle, it's an excellent plugin!
I'm still only giving it 4stars though, as there are obvious improvements that can be made to the UI.