Nope - changed my mind on that one - I can't see how the bookmarks work. When you want to see the latest posts on a thread that you're watching it seems that you now have to plough your way right through from the top of the thread to where you left off. I don't like the "flip" option as I prefer the posts on a thread to be in chronological order with the newest at the end. You used to be able to go to "watching" then click on the end name which would take you to where you left off last time and just do a "bump & reset" to save your place for next time.
Sorry - I'm not explaining myself very clearly, but I'm confused 