The revised version (April 2014) is an improvement over the 2013 version. A filediff of the two epubs shows over 5100 edits. Most obviously, the current cover picture is much more appropriate to the content. That's not a major issue, but the old cover irritatingly gave an incorrect impression of the story. The new version has an additional appendix on the principal features of money (fungibility and total quantity). There are many very minor edits (mostly dialogue), which makes the conversations between characters flow more smoothly than in the 2013 version. The overall story is the same, just slightly more polished.
I still have a quibble about certain witnesses being allowed to live long enough to record their testimony. It would be more likely that they would be promptly killed by a house fire, car crash, drug overdose, or other "accident" with plausible deniability. That's a very minor issue, and their their survival was necessary to the story. Overall the book was excellent, and very good value for the price.
(reviewed 9 days after purchase)