The PDF reading experience on iPad is fist class. The iPhone version fails on so many levels though.
Firstly, I like how the Crop Mode is working on iPad. I hate how its missing on iPhone. To be fair, iPhone version does follow GoodReader and implements Text Reflow, but that doesnt do well to all kinds of books.
Then theres the scrolling on iPhone. The zoom does not hold. Tapping does not scroll, but rather brings up the interface. Madness.
Had lot hopes for iPhone version but I still recommend GoodReader over this for small screens then.
Grzegorz Kozub about PDF Expert - Editor and Reader, v5.1.1