From the introduction - quoting another author, Henry Cloud, "It is interesting to compare a legalistic church with a good AA group. In the church, it is culturally unacceptable to have problems; that is being called sinful. In the AA group, it is culturally unacceptable to be perfect; that is called denial. In one setting people look better but get worse, and in the other, they look worse but get better."
This, I think, hits to the heart of what Joe is writing about. Joe follows up this quote (and he quotes many, many authors in this book) with the rhetorical question: "Which kind of setting should the church be?"
The fact that this is rhetorical kind of seems to hit the point too - honesty and directness is easier to find among addicts than among the saints. Maybe because we're often rhetorical or passive when we should be direct and aggressive. Sharing sin struggles is hard. Sharing hardships is hard. But for the church to serve her purpose and truly bear one another's burdens and produce sweet fellowship, we need to do hard things.
This book lays out the problems effectively and produces principles on how to become more transparent in a positive way. The pharisee in me would love more practical steps (I would love Joe Smith's top 10 ways to become more transparent!), but this book is going to make you reflect.
Even if you aren't interested in church (and I would suggest that you should be!), this book persuasively proves the benefits of true honesty (that is, transparency) in relationships everywhere.
Read it.