Harrop-Griffiths is a very good professor and gives clear, useful lectures. Pay attention in class and learning the material will be easy. However, 32B is a pretty hard class altogether so applying the material on tests is up to your own knowledge/practice. The tests are reasonably difficult (~70% average) and the class is usually curved a bit. There is required homework which is actually graded, but there are no discussion quizzes, so discussions are optional. He also makes you write your math in sentences which I don't mind and I think makes it easier to explain your thought process and gain partial credit.

Professor Ben has a very different way to teaching this class (most professors go straight into double integrals, but he really likes to take things from a visual standpoint). This is both very intuitive and very engaging. We didn't see double integrals until fourth week, as we went from line integrals to double integrals to triple integrals.
His lectures have a very clear format, going by definitions, drawing pictures, and then moving onto examples. He does very well in answering the questions that are asked in lecture very precisely, and also his midterms and tests are pretty fair (the midterms are mostly like the homework problems, while the final was a little more difficult but in hindsight, very fair). The only caveat I would say is that he requires you to explain your answers throughout your steps, but I would argue that is actually a benefit as it encourages you to make it easier for your grader to understand your thought process, something that will come in handy for future examinations in any subject.
Overall, I would definitely take this class again (I made some silly mistakes that cost me a part of my grade, but I did very well on the final as his preparation he gave was very accurate). He definitely makes Math 32B a much more reasonable class than other professors.

Harrop-Griffiths is the best math teacher I've ever had. He's clear, explains the concepts well, and is also funny. 32B is supposed to be one of the hardest lower div maths, and yet I never felt lost in this class because he is simply that good at teaching the material. Going to lecture was something I looked forward to just because I liked this professor so much. The final was significantly harder than the midterms, but the class is curved so it's not that big of a deal.

I am beating myself up for the grade I got, but I have nothing but good things to say about Harrop. He goes by the lecture pretty quick but give one or two lectures and you will get used to the pace. Harrop is incredibly clear and is willing to answer any questions.

It needs to be said that the final for this course was WAY harder than the midterms but be curves the class so no biggie. You need to know the properties of everything fairly well because each exam will have at least one question that is just manipulation of the equations.

Don't be like me, study hard and ask questions!

He is an incredibly articulate and helpful professor who gives very engaging lectures. Even though the material was very challenging for me, I thought that he tries his best to make your experience as easy as possible. He is the best math teacher I've had so far and I would definitely recommend him.