Pro:
Seems zippier. Like the multiple page turn feature (ie hold down the button to continue turning pages). No more slowdowns, and no more non-bookmarking.
Con:
New, more serious problem. About once per day it corrupts my memory card. I have to reformat it and reload it. Although it now always takes bookmarks, I loose all of them when I have to reload from the PC.
Of course, none of the new features like library directories, and better navigation within a book.
Overall -- negative.
Michael