The one thing I find irritating about e-readers is that they don't have a physical way of showing you the progress you've made by becoming thicker on the left and thinner on the right (or otherwise around should you read from right to left). That's the one thing I still like about paper books
(Some e-readers have progress bars, or page number-like progress, but in full screen mode, the KA1 shows nothing but a wall of text. In non-full screen mode where it can show progress, it wastes half the screen with whitespace and headers and footers...)