For years, I thought I'd always have room in my life for hard copy books, and that e-books wouldn't really have a place for me. Then I got an android smart phone and loaded up Moon+ reader (an e-reader app that reads basically every format and is insanely customizable), and long story short, I haven't read a real book since. Eye strain just isn't an issue, since not only is the backlight fully adjustable, but you can change the theme to various combinations of background color/texture and text color, effectively giving you the perfect level of visibility for any conceivable lighting situation. Add that to the fact that I basically always have my phone in my pocket -- and therefore a library of books -- and I've gotten more reading done in the last year than I had in the previous five. It's that big of a difference.