This book contains a wealth of information. First of all, it has a concise biography (by Jack Kilcrease) of Flacius, who was a truly interesting and influential teacher after the death of Luther. I've included the facts of his life in my personal notes attached to this review, so I could remember all his notable achievements.
Secondly, the book contains an important work by Flacius -- a systematic analysis of the obstacles encountered when reading and interpreting Scripture, and his "remedies" for these obstacles. It strikes me that today's guides to reading and interpreting Scripture have the same personal and technical (grammar, historical context) guidelines, but we fall short on the spiritual guidelines -- reading the Bible in faith (another spiritual guideline, and this one does get repeated today: preceding the reading with prayer for guidance and the Holy Spirit's help). Flacius has an amazing list, often complete with examples, of the correct way to read and study Scripture.
The book had a few flaws. A paragraph of Flacius' book was repeated a second time; an average proofreading process should have caught that. The translater, like me, prefers to capitalize pronouns that refer to God, but on one occasion where Flacius reversed the pattern of several sentences, the pronoun was capitalized, and it didn't refer to God. The biggest flaw is that for whatever reason, the book is incomplete. This is unfortunate because often Flacius refers to points made later in the book. The book would be better complete, and with an index!