If you want to see if your PDFs are usable "as is" (or after soPDF) on the PRS-505, download the Sony ebook software to a Windows PC. See
Sony's Windows ebook Reader. The software now emulates a PRS-700, except that it does not have zoom or landscape mode. Note that the PRS-700 is more capable than the PRS-505, particularly for research, but with a fuzzier screen.