Man, as much as I want this I know it's going to be out-of-date every few years.
I got the revised edition and it's pretty good, but as a big canon fan I knew most of it already--it's just nice to have something easier to refer to than page numbers from another book. Most of the big differences are expressly clearing up minor details of contention that could have been seen as multiple interpretations.
EDIT top page? Random GIF!