Barryem, I did a small video with Moon+reader, really simple also does not focus well because I used an old phone, but the screen is much better as in the others video reviews
just to show you that it works and eink is responsive
https://www.youtube.com/watch?v=M48gwKEFlz0&app=desktop
EDIT: it looks as is not immediately responsive when i select the word, because I was looking into the camera not the real screen, so I did not centered the word as the first attempt, but in real life it works really well