In class, we had not gone over AP Physics B thoroughly. This book was a quick, easy and entertaining way to learn the entire subject. I was able to read the entire book twice throughout the year and it was a huge help. It's explanations of difficult concepts are great and easy, and there are many techniques it uses that are outstanding. A week before, I supplemented this book with Princeton's (which was a lot more difficult but also a stellar book) and took the exam today. I am not sure how well I did, so I cannot say if this book was influential or not, but though it had a few mistakes which were all rectified in the next edition, it is great.