Fall 2023 - I did badly in this class, and that was not the professors fault. However, Gangbo's lectures were dry and at times confusing to follow. The exams were difficult, as to be expected in an honors class. The homework was exceedingly difficult at times and graded for accuracy, probably more than to be expected in an honors class. There were multiple occasions when I emailed him and never received a response back.
Fall 2020 - Professor Gangbo is chill, and the workload for this class is much lighter than 245A by other professors. He is a typical professor who teaches throughout the 50 minutes class without trying to engage students, that doesn’t bother me at all since it’s a grad pure math courses to learn knowledge. I heard that he was not so clear in the last year, but from my experience, he is relatively clear on the materials when the class is online. The exams are not too hard, and the midterm is especially easy. I would generally recommend taking this courses with Professor Gangbo, since it might be easier to get an A (though grades doesn’t matter to grad students). He and the TA can be unnecessarily strict on minor things, but I guess that is how rigorous pure math works.