[DrMoze]

Remember, e-ink devices are geared towards people who want to read books (or large amounts of text) comfortably. The display is very easy on the eyes, closer to ink-on-paper than pretty much any other electronic display.

E-ink is not good for "skimming" pages (which does not appear to be the OP's desire anyway). Nor is it very good for instant updates, and it is not the best display type for graphical content (comics, etc.) And it doesn't do motion or color. Or scroll text.

The comparison of the flash with turning a paper page makes a lot of sense and is entirely relevant with respect to the reading experience of an e-ink device. When reading a book, your eye travels to the bottom of the page. It then returns to the top of the next page while you turn it. Eyes go from bottom of old page to top of new page while page is turned--start reading. We do this unconsciously.

Pretty much the same thing happens with an e-ink device. Reach the bottom of the screen, press button, flash occurs while your eyes are going back to the top of the screen, start reading.

Now, timing may not be exact for the page turn/reflash analogy. But, as pretty much every e-ink owner has noted, the flashes "disappear" once you are actually reading. So, I would not be so concerned with viewing a video that shows a brief "black flash" of the screen, and consider more strongly the uniform reports by actual users that they never notice the flash. A slight difference in page refresh speed should not be a criterion for selecting a particular e-ink device, imo. None of them are that slow as to be distracting.