In a further effort to keep Jon happy
I went on a mission yesterday morning by going into the largest seller of tablets and E Ink readers around here. I went in soon after they opened when they were not busy so I could have a chat with their sales people (I regularly have a look at the devices on sale but had not talked to sales staff for some time).
They had a range of Kindles and Kobo devices on display. First, as far as display of greyscale is concerned they were all abysmal when compared to any tablet worthy of the name. Of course that does not matter much if one just reads text and that text is just black on the screen.
I recognize the following is just from one site in my own country, but from what I hear it is representative. They advised that people are, in general, selecting tablets over E Ink devices for both a better reading experience and because they are more versatile. The Kindle Paperwhite was the biggest seller of the E Ink devices, probably because the Kindle name is much better known to casual users than Kobo is.
The salesperson I spent most time with volunteered that he no longer uses his Kindle, instead using a tablet and the Kindle app for reading. Like me (I swapped from E INK to tablets some time back) he would not go back to E Ink, at least at its current state.
I look at tablets quite often and for reading, of the ones I have seen, the current Samsung S range with their AMOLED displays seem best to me. They are expensive though and I cannot justify the extra cost for reading I stick with LCD (a Samsung at the moment). Note I do not look at Apple devices as I have no interest in that ecosphere at all, so can't comment on them.