I have a slight issue with reading PDF books with iBooks. I can see the text fine, but it would be better with a slight zoom in. The problem is iBooks resets your zoom when you switch to another page. Are are there any other similar quality apps (preferably with the bookshelf, high quality text, go to page option and stutter free experience when flipping pages)? Converting PDFs to ePub isn't an option as the result is very bad.