As a video is better than a long description, here is what debian looks like on a Eink screen (Kobo reader) : https://www.youtube.com/watch?v=8rkoHcJGo18 (I tried it, it was fun to use, but you quickly get mad of the flicker).
There are some other people who tried similar things, with great success like https://www.youtube.com/watch?v=Ob67Fgd_ZgE. You can see there is less flicker, as they are using a trick to reduce the full redraws of the screen, but that create ghosting and at some point you still need to do the full redrawing cycle to see something (full white, full black, full white, then only display what you want) which is hard on the eyes. It is ok for readers, when you have only a redraw each time your turn a page, not on something dynamic like typing a mail at a decent rate.
That is not from the latest Eink tech, but I didn't heard they solved this so far.