Horrible!
He is a wonderful man. He has a nice personality, he tries to help his students, he is smart (as mentioned here) and he loves the subject he's teaching. If that's all you need to know, then yes, take him. But if you need a good GPA (medical, law, masters, tech. etc. in the future) STAY AWAY.
You will have to learn on your own. We got together in study groups and had to look things online. He posted a "study" sheet for the midterm which was a list of words/terms he has used. SOOO HELPFUL! When 1/2 of the class failed that test, he posted a real study sheet for the final. He ONLY included the imagination, the second half of the course, and described everything we needed to know in detail. At the last review session with the TAs, we were told that if we knew that sheet, we would be ok. When I walked into the final, out of 14 questions, the fist 5 or so had NOTHING to do with the imagination but instead covered the same shit people failed on the midterm.
Just... ask anyone who is UNDERGRADUATE and has had him. The positive reviews are from graduates. That's the problem! He is used to teaching upper level seminars or small type lectures where he can go off tangents, etc. He is terrible for lower level and, most of all, he will most likely f*** up your GPA.
SO! IF this is your LAST quarter at UCLA, DO NOT Take or your GPA will drop.

Worst professor/teacher I have ever had. He was the most confused and unclear person I have ever met. Half of his students wouldn’t show up because it wasn’t worth showing up to class. Don’t take a class by him. Save yourself the headache.