epub is just as easy to get on your machine as pdf is. To download epub, you just do it the same way you do pdf library books using ADE.
Interestingly enough, a few of the epubs I downloaded are larger font sizes (more like sony books) and a few are more like PDF (smaller font size). When I increase the font size, it seems to work just fine still, in my limited experience playing around with it.
It doesn't seem to skip any words or miss any parts of the page. I haven't played around with it too much yet, but pdf isn't too much of a problem for me. Although I have no trouble with the smaller font of many pdf, I do feel like it's a treat when I get to read books with larger font, more like sony's.