Tried it before and after installing a test site for WP 4.9, I saw the big notice in the admin about Gutenberg. So I decided to try it (again), but honestly, this editor is not user friendly, efficient, nor is it well thought out in respect to a content editor UI as it should be.

Things are spread out everywhere, hidden to a point you have to go searching for elements of an editor (or try to remember where something was), little popups that intrudes on the content area....to much eye movement needed, clicking, and right clicks.

For posts...took me almost 8 minutes to find the more tag insert...only after I went to search for google on where it is.

This is definitely not an editor if you have complex content and layouts within a page or post, or a mix of different media elements....simple text based posts, maybe. But it still doesn't have an efficiency about the whole writing experience with everything in one spot and easily accessible editor components as you create content, such as the standard toolbar of an editor.

I gave this editor 3 hours of my time to create a variety of pages, posts, and a mix of simple to complex content. Definitely not an editor for me. As for the masses? I have to say no.