Ive used several reading apps over the years and for several reasons i enjoy the Kindle fo iOS. Unlike the Mac OS version, the app can read and navigate all my books. e.g. Novels, music scores, animation cells, etc.
The interface on my iPad (4th generation) is responsive and easy to use. More importantly, when i do make mistakes i can usually undo and get back to where i want to be.
OpenedEyes about Kindle – Read Books, eBooks, Magazines, Newspapers & Textbooks, v5.13