"Also on the list of features lost from PRS505 is that ability to go "step back one" that could be done on the PRS505 with the press of the Menu button. The Home button on the PRS600 takes you to the Home page and the Table of Contents takes you to the first page of the TOC. There is no way to go back one step, to the same level of a mult-level TOC you were before you entered an article."
(sorry I can't work out how to quote!)
If you look at the top left hand corner of the TOC screen you'll see a square with a pointy back arrow on it. That's the back button. Not intuitive, not documented, but there!! (and in other places too)
Good review BTW