Our local library is in the process of changing from the OverDrive library to the 3M Cloud Library.  The 3M Cloud Library will not support the Kindle format.  In order to continue checking out e-books, I had to buy a Nook.  This was a used 2 generation Nook.  I still like my Kindle better than the Nook, because the Kindle gives me the option to read horizontal or vertically.  The Nook does not offer this option.  The quality of reading is the same as the Kindle.  You can read the Nook in direct sun same as the Kindle.  The buttons on the sides of the Nook to turn pages are very stiff.  The swiping and tapping is another way to turn pages, but unlike the Kindle this requires 2 hands, one to hold the Nook and one to swipe or tap the screen.  Overall the Nook will do as a e-reader when the Kindle is not available.