Works fine. Does what it says.

Tested with WP5.2 works fine for me.

I use it for a site where we have multiple user roles and certain user roles (editors) have not the capability to edit others posts. This plugin then is useful to associate multiple authors to pages/posts giving the co-authorship and as such the possibility to edit the page/post.

I haven’t tested the tags but looking at the documentation it makes perfect sense.

I would say this plugin is intended for users with development skills if you want to use the front-end aspects of it (functions/tags).

cheers