I've tried it a few times on my kindle, and it sounds like a nice things to have. However, the screen's refresh rate is crazy low. I'm guessing that can be improved, but that would likely come with a battery life hit. More importantly, good luck scrolling on a webpage where it takes you a second to see how far you've scrolled. Same issue were you to respond to a comment: typing with that sort of latency is absolutely dreadful. E-ink works great for displaying text and is so much better for reading than a screen, but there's definitely some more technological work to be done first.