I agree with you guys, I think that ISOCF is truly an excellent book - a must read for any ex-JW. In my opinion, it just might be better than Crisis of Conscience. I think that it is more powerful than COC in that COC was mostly a collection of accounts of the controversies within the Governing Body and Brooklyn headquarters. The average JW reader could dismiss much of it as "one-sided" exagerations or fabrications.
However, ISOCF addresses the core foundational doctrines of the JW organization and deconstructs them scripturally. Franz does an excellent job in taking apart the concepts behind the organizational structure, the governing body concept, and the Faithful Slave doctrine. Not only does he document particularly damning articles, but he also shows the fallacies of these doctrines using the Scriptures. His Scriptural presentations cannot be so easily dismissed by JWs.