I could not do without my Kindle (and my Kindle app across my devices). I read (and purchase) many more books now, as the e-versions are cheap enough to be an impulse purchase. Also, no trying to remember that book recommendation any more as I stand in the book store. The one disadvantage — for me — it’s difficult to estimate how far through the book a particular passage is, if you haven’t marked it. So I flip back and reread passages far less often. I have read an entire book on my iPhone Kindle app.