In my experience this plugin in combination with my domains connected through cloudflares free plan for domains offers great performance. Simple to set up. Some settings might break your sites as css and javascript optimizations did with mine, but apart from that its great.

The major bug that hopefully gets fixed soon is that some pages wont get cached, unless you visit them yourself. I noticed my category archive pages on my webshops didnt get cached for example but the plugin does say that a 100% of my pages have been cached.

after visiting the pages it would go from 100% (50) for 50 pages to 100% (51) for example. Meaning it does cache the page after visit but originally didnt count that page.

I have contact with the developer and have given him the details needed to look into it.