Compared to FVM and Autoptimize, this plugin is really simple. You set up the plugin thanks to one page. And you can check the cached page on the very same page where you change the settings.
The developer really focused on JS and CSS. There is no adhoc stuff like lazy loading, removing HTML comments, removing querystrings. I am happy about it because I discovered that autoptimize had a bad behavior with stripping querystrings. It messed up my wordpress structure.
Conversely, This plugin MMR sticks to what we expect from it => optimize JS and CSS. I really like when a developer just focus on a very well-defined goal rather than babbling in different wordpress area.
GOOD JOB