Both estimate from mobi/epub and download from Goodreads works for me now.
Disabled wordcount(of course I didn't remember that the first time I tried

), and downloaded pagecount for a pdf as well.
I've never really been bothered with which Goodreads-edition my books where linked to. If I'm going to use this I guess I better start paying attention... I've only had time to take a quick look at the switch edition bit of the Goodreads Sync-plugin, but it looks great.