Recently I had to read two books on an iPad (borrowed from the local digital library and they don't support e-ink devices here in Denmark). The positive thing I have to say about that experience is that the books contained some very nice colour illustrations. The e-readers I have tried, and I own three of them, all fail to deliver a satisfying result displaying illustrations and images.
My personal favourite for long book reading sessions however remains an E-ink device. Even when experimenting with adjusting the screen light and brightness, I didn't take to the lit screen of the iPad.
I do prefer prefer an iPad or Android device over E-ink for reading PDF and CBR format files such as magazines, newspapers, comics though.
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