I have a few e-ink based readers, and I just picked up an x4. Honestly, it's kind of fun. It fits in my pocket with my phone, it has clear and readable text, it has fairly comfortable buttons. Will it ever be my sole e-reader? Nope. Do I see myself continuing to use it to grab a book from the Project Gutenberg OPDS feed, to read whenever I'm in decent light and not doing something? Sure.