With much trepidation (leaving on vacation in two weeks), I upgraded to V2.0 last night. All went well and I settled in to continue reading my current library (epub) book.
Two observations:
1- Page turns are a little slower, enough to be a little annoying.
2- Checking into Annotations, I notice that the bookmark set at Chapter 23 is identified as "Bookmark: 5302% into chapter". When in Sleep Mode the screen says 53% Read. Sloppy math, me thinks...