I enjoyed taking a class with Professor Abachi. He usually explained the ideas in lecture very well, and his clear derivations of formulas usually expanded on the conceptual ideas rather than making the class dry or boring. Outside of class, this professor made himself available all the time--he was always helpful during office hours, on the discussion board of the class website, and on the extra afternoon review sessions that he himself held before exams. He is very knowledgable about the material he teaches and will find different ways to explain this material to make it understandable. I would recommend reading the book and going to his office hours because sometimes he goes a little too fast in lecture, though he does pause often to answer questions during lecture. His exams are straight-forward, and he offers "pretend-exams" that are extremely good to study before midterms and the final.