The book is well organized and Mounce explains things well. Where this book is very weak is the Greek examples of concepts taught are often terrible. That is, he will very clearly introduce a concept and then the Greek example he gives will contain some sort of exception or needless complication. For example, when teaching on relative pronouns, he shows the paradigm which contains the words "who/which/that/whom/whose." And the very first example he gives doesn't use one of those five words. Rather, he translates the relative pronoun as "whoever." So you read it and think, "I guess it can be translated as whoever as well, or maybe there's some word in this example sentence that turns the who into whoever?" His examples will be filled with multiple words we haven't learned yet. Why wouldn't the first example you give use one of the actual words in the paradigm you just taught us? Then once you make it clear with a few easy examples, then give some exceptions and explain the special circumstances.