PDF:
I use PDF's on my reader. Short papers I read with the build-in-reaer. But books in most cases will be converted to EPUB. Therefor
ABBY PDF Transformer is the software I use. It's less time-consuming than Acrobat and gives very good results. In case of illustrated PDF's manual twaking is necessary most of the time. One book can take 1 hour to convert into EPUB.
ZORK-Edition:
A new version for 350-readers is online. You'll find a new options to
choose default page-layout. Usefull for example when reading without page-margins. Changing font-size, line-height or opening a new book does not require switching to your preferred layout any more.
A.