Oh no... it wasn't worth it. I upgraded via Calibre on my Clara HD and now it's showing me the setup screen.
I had about 1514 books, and now it's showing 884. What. Somehow this didn't happen in the previous firmware update, though. All of my stats and collection data are gone -- which file should I replace to get the backed up stats back? If it's even possible. All of the books are set to 'unread'...