I also have recently taken PIC10A (Winter 2012) with Dr. Cheng, and I should say that he is one of excellent professors out there at UCLA.

His personality and lecture style are less exciting than Dr. Jay Phelan and Dr. Craig Merlic's lectures (look them up, they are godly!) but I would say his lecture style is comparable to Dr. Corbin's.

His homeworks are really tough. It's tough to the point where you spend few entire days trying to finish each homework! I'm not joking! The first few homeworks were breeze, but after when we covered vectors each homework he's given us totally took me forever! His last homework was such a relief because it took me a far less time than the previous ones.

He also posts exercises to help you understand the material better, and it was definitely helpful for homework but I really wished he posted solutions to them online because it would made things far easier.

Anyway going to his office hours helped me a lot understanding what I need to do for homework (and tests). His way of helping me understand the materials is like Dr. Craig Merlic's way (look up Merlic. He will blow your mind).

His midterms were pretty easy if you did homework and exercises. But.... his final..... it was really challenging compared to his midterms. I pulled nearly perfect scores for both midterms but I doubt I did well on final as I did on midterms (well I didnt sleep on that day so I'd blame myself).. It was doable but the difficulty of the final exam was comparable to homeworks he's assigned in class. so guys.. do your homework and exercises.

And seriously I don't want to say this again but go to his office hours! He is super approachable and awesome, and he earned his Ph.D from Harvard so you know he's genius.

And yeah, he posts all the lectures online but I don't find them helpful as much unless you go to each corresponding lecture or office hour for help.

P.S. For those of who took PIC10A with Dr. Cheng and are math majors/minors, he's teaching Math131A for Spring 2012! Don't miss your chance!