The Kindle Paperwhite's electrophoretic screen is mostly very good, but I'm still not thrilled with the sporadic refresh of the screen. See, the electrophoretic screen isn't like a normal LCD, where you can have individual pixels display any color you want--it's more like an Othello board, where each pixel is a physical thing (dye suspended in oil, basically) that flips when electrically triggered. To do a full refresh, which takes maybe a full second, you have to make the entire screen go black before displaying whatever you want it to do--it looks like the screen blinks at you, and then the background is perfectly off-white and the text perfectly off-black, like a just-shaken Etch-a-Sketch. The old Kindles used to do that every time you turned a page, but to save a split-second of time, the newer ones just flip the little Othello-like pixels as needed, and only fully refresh about every five page-turns. That leaves a little bit of an echo of the previous page's text in the background of the screen--sort of like holding a sheet of paper printed on both sides up to the light. It's not that bad, really--the Kindle is always totally readable, and indeed the text is crisper than on any other ebook reader, including past Kindles--but it can sometimes be a little distracting.