For me ISOCF was the first book I read after much of my own research.
I felt empty..still do by times but Ray's book simply explained so many biblical things that as a JW never made any sense.We were told to wait on Jehovah...don't understand no problem no one else does either....it's a mystery like the trinity which they so often malign.
I have not read COC yet but have read the Gentile Times Reconsidered....I had to lay off things for a while as it had become my obsession.