My colleague Alex, who's in his second year of physics teaching noted how wonderful this book was because it provided access to solutions -- not just answers, but explanations. And he made me pause for thought.
I remember how many times, especially in my first few years, that I could get an answer right without being able to form a coherent and straightforward explanation that a student would listen to. It took years of experience to bring explanations down from the M.S. level to the high school level. Alex works his rear end off preparing for classes and writing tests. If he's going to use a question from this prep book on one of his tests, he's going to solve the problem. But, he wants to have the book available in case he gets tongue-tied with an explanation.
The point that Alex DIDN'T make but he might have: How many times is a newish physics teacher faced with a know-it-all student trying to make a tortured, lawerly argument that he should be given credit for an answer that the teacher knows is wrong? This prep book has detailed enough answers that it can be used as an authority. "Shut up, kid, and look at this detailed solution. I'm right." Obviously this approach is a last resort for a student who simply will not listen to reason. However, that happened to me enough times that I know how useful the authoritativeness of this prep book's explanations can be.
Dan Fullerton's book is the size of a novel, and is paperback. The size limits the layout possibilities, so that the text looks dense and it's difficult to thumb through to look for things. (That's the only weakness we noticed.) Diagrams are clear; the graphics are humorously drawn and appropriate.
If my kid were taking Regents Physics, I'd buy this for him; if I were teaching Regents Physics for the first time, I would want this book available to me.