Adding a picture of how epapers look like. Apologies for the bad quality.
http://s10.postimg.org/ea4zfz1l5/image.jpg
Newspapers which are letter-sized look really nice on the DPT-S1, which the screen size is optimized for. Epapers which are A4 sized are not as good, since it is longer on its vertical side and fonts can get quite small (need to zoom which is slow).
I don't know if it has replaced my writing, but it has surely replaced my newspaper readings (ipad does this too, but at least for me, words flow into my mind better when I read on a epaper and scribble on them).