i found it very easy to use. at first i looked at the menu and wondered for a while, but then i read it, found similar setting as my golden and warm days with f.lux

brightness 0, contrast 10% and sepia 50%! perfect! many cheers!

On some sites, it stuggles to load the dark, so for several seconds the page is totally white, and we see the dark coming gradually from the top to the bottom.

5🌸 ⭐ 🌞

If in Google Docs, it inverts imaged no matter what settings you activate. Otherwise, works pretty well!

Great! It works very well, but i don't like it when it try to up sell me

A lot of people are either 1 or 5 star reviewers. I think one star is quite harsh.
I'm not impressed with this extension and was surprised it was a recommended one. I agree it isn't very intuitive to use but even worse it that it slows my browser down immediately to the point of being unusable. Google e-mail will not even open.
It would appear however this is a recent issue.

the least intuitive garbage I have ever seen in a dark mode app.