I've enjoyed ink displays, but my kindle has been dead for some time and it was always kind of a pain to load stuff on too, most papers would require some kind of zoom as well although I'm sure they're better these days.

I do love an e-ink display, but I just like holding a sheet of paper, and not having to jump through menus to read something especially if I'm actively referring to it and revisiting it. Plus I can use my coloured fineliner on it, whereas the PDF viewer on my iPad crashes sometimes crashes if you look at it funny.