There is a lot of good in this book; the basic premise through the essays is that the Bible is God's infallible and sufficient word, and that adding in other sources (particularly Roman Catholic tradition) is unnecessary. If properly interpreted, the Bible is all-sufficient for the life of a Christian.
The problem with this book is two-fold. First, many of the essays overlap and keep repeating the same scriptures and the same points. But second, it does not answer many questions that cause some to look beyond Scripture. Among them: a. How do you interpret it? Indeed, this is a major roadblock for many. This goes beyond the scope of the book perhaps, but the fact that interpretation is necessary at all (and often a dividing point for many earnest believers) would make one question the sufficiency of the Scripture itself. b. If Scripture is infallible, what about Scriptures that seem to contradict or at least are very difficult for even the most scholarly among us to interpret? Does this question not lead some to find other sources of authority? c. If Scripture is divine and indeed 'God-breathed', how do you explain the humanity of it? Paul might have been inspired, but he wrote as a Jew, a Pharisee, an apostle. Psalms is indeed sacred song, but it bears the mark of humanity crying back to God.
There are many good points to this book, but it was a bit limited in scope for my taste and did not take seriously some of the reasons as to why others have sought out other means of authority.