Sarsgyan is definitely a smart guy, but he was an all right professor. During lectures, he'd be reading off his notes most of the times and these notes would just be the textbook reiterated. What I did like was his humor. He did try to make sure we laugh during class.

The class is definitely hard, but then again, Math 31B is one of the harder math classes. His main focus was PROOFS. Although his notes are a reiteration of the book, going to lecture is helpful because he highlights the proofs and problems that he wants you to know. Doing ALL the homework (which is unfortunately massive at times) will help get you get a great grade in the class.

Overall, a hard class with a decent professor, but can have a GENEROUS curve. Many people failed the final, but still managed to come out with a B.