Good app. Haven't had too many problems. Love being able to have all of my books with me. Update 2/23/22: The Nook app has some pretty big bugs. It seems to be listing my books twice on my tablet It also does not sync as well as it did in the past. When I upgraded my phone and logged into the app, my library is not there. Only showing what I am currently reading on my tablet. Seems to be more of a pain and has me thinking it is time to ditch it and just repurchase everything on Kindle.