PDF is my prefered (and as-good-as-only-read) format i use on the pb (360 as 302). The page turning is bit slower as in epub (but only a bit, in fact, it doesnt matter!). The Reflow of PDFs is working in the very most cases. The size of the font isnt too small for me (most time even without any zoomoption).
What you dont have in PDFs is, the customising of the font for yourself and the size of the font. But for the size there are pretty much zoom options
