The overall performance is great. There are a couple of glitches in the settings (e.g. selection arrows that go nowhere when you choose them, etc.)…very minor stuff that does not impact reader functionality. The user interface is very intuitive. Ability to customize almost everything is a plus, but maybe too much for some; however, the functionality and default settings have been well thought out. While reading, it remembers other locations you navigate to so you can quickly move between them, as well as between adjacent chapters. Once you close it, it remembers the last location but not the rest of the history. Navigating is simple and quick enough that this is NOT inconvenient. It remembers the width of the reader and note panes you set in both the portrait and landscape modes (very convenient). The amplify and context functionality for the notes is a nice touch, as is ability to change text style and size of them. The verse numbering is great because it draws your eyes to the verse number for quick recognition (I cannot emphasize enough how great this is). They standout boldly against the text and all the other reference numbers and letters used for the notes; something the GTY Study Bible app does not execute well. A simple, classy, and well implemented presentation overall.