The paperwhite screen is nice, but whoever signed off on the paperwhite's touch UI exhibited some poor judgement. The onscreen keyboard is fine; the page turning is merely adequate; the book list and web browser scrolling is terrible. (The scrolling uses touch-and-drag, but the software doesn't actually scroll the screen until you release your finger, which makes it very hard to judge what's going on. Touching and dragging requires low latency and a high refresh rate, making it a very bad choice for an e-ink screen.)

A few physical inputs would make this device twice as good. Two buttons and a dpad would do it...