The concepts and ideas here are fairly clear...although if you are looking for writing based on recent evidence, you may need to find another book (in fact, any references to peer reviewed evidence is slim here). Some specifics, but not the kind that would help secondary school teachers beyond making general changes. As always, middle school examples are common...and it is presumed that any reasonably good teacher will be able to generalize these to their classroom. Some of the scenarios are helpful in imagining how the ideas would play out in class, but these are generally short and under-developed. For example, in lines like "Mr. Connelly formalizes the procedures, reviews them with students prior to implementing them, and asks students to reflect with him on how the procedures worked to help them work effectively and efficiently", the authors remind teachers to have students reflect on the procedures, but WHAT does THAT actually look like in different classes? What do teachers ask when having students reflect (surely not "Hey class...reflect on these procedures") and what are the students actually DOING ...are they speaking in pairs, writing quietly? I guess I am always looking for more specifics than these books offer, and of course that does not take away from all the great things this book does provide.
Tomlinson and Co do better than most writers in not pointing fingers or making the average teacher feel like they are massive failures on a daily scale. However, I think using words like "indefensible" is one of the reasons so many of my younger colleagues seem so anxious every day.