This looks interesting, but it's the software that will make or break the experience.
Software aside, this is expensive ($479 when you select the pen with the eraser and the book cover), and the screen is not back-lit, so this won't be usable without other source of light.
Why is it so hard to find an e-ink device that's good for reading books, PDFs, and web content (e.g. Pocket)? So far, everything I've tried has fallen short.