1. I have zillions of Kindle books. I have one of the early Kindles. I have one of the more recent Kindles. I have the Kindle app on my iPad and on my Android phone and on my Macs and on my PCs.
2. And now I have a PaperWhite and I am finally happy.
Why? I can read in bed at night, comfortably, without keeping my wife awake.
I can now put away the iPad. It was heavy and uncomfortable.