I took 31B with him in Fall 2016 and now I'm taking 33B with him Fall 2017. I literally doubled up on math classes this quarter just to take 33B with him, he is that good. He's super funny, super clear, approachable, and really helpful. Best professor I've had at UCLA. I would take every single class with him if I could, and I'm a little sad that I'm about done taking math classes because I won't ever take a class with him again!
The workload is fair, and he always gives extra practice problems with each assignment so you can use those to study. His tests are fair, not too hard or too easy, and he seems to get the distribution right each time.
His lectures are well-paced and he's always excited to answer questions. Take a math class with him if you can. He's the best.