Dear JVIPER88:
I work for Astak so I am biased. I would just like to add that the user-replaceable rechargeable battery and the 14 formats and the Text-To-Speech of the Pocket PRO are huge advantages for it. PLUS... the crush-resistant case and the ear buds are included.
Go to:
www.theEZreader.com and see what professional reviewers think!
One of the most recommended lights for the Pocket PRO is the "Mighty Bright Extra Flex 2" now selling on Amazon at $13.45.
Thank you for considering the Astak Pocket PRO. The Sony 505 is a good device but getting a bit old.