[conan50]

I'm in the minority, but I had every Kindle e-ink device up to and including the paperwhite and even a nook, and I could not get used to any of them. I want good contrast and dark print evenly lit on my devices. I use Kindle tablets 8" and 10" to read on. Like others have said, the key is brightness adjustment. I keep it bright enough for good contrast but not enough to irritate my eyes. The only way I could comfortably read e-ink was with an external light and it still did not look as good to me as on a tablet.
Edit: I should also add that I like about 13-14 point text to read comfortably. By the time I set that size I'm left with a couple paragraphs per page. I'd rather have a larger screen and more text per page. I know there are 8" e-ink devices now, but they came too late to interest me and I still like the even lighting of a tablet.