There's the obvious issue of being able to change font sizes (my 56 - year - old eyes suck), but in addition: I like the compactness of the reading experience; I seem to be able to
scan a story better (that is speed up and slow down the reading process); it's also
awesome to set up a catalog of highlighted text with book
apps; and I can jump from my phone to my iPad to my Kindle and then to my laptop, meaning that wherever I am whatever I want to read is always with me.