I had Prof Wang for 1A this fall, and overall it was a good experience. Wang is sometimes not the most clear at explaining the concepts, but that is because his main focus is on research and he doesn't teach at the lower level too frequently. That being said he is one of the most caring professors I have had. I went to most of his office hours and he had 2 hours of OH 2x a week, which is a lot more than most professors, and he was extremely helpful in office hours, as well as an overall funny guy to talk to. I would reccomend him to students willing to go to OH and put in the work.