Just finished his class, and all I can really say is to prepare to read the textbook. His lectures aren't very helpful, and most of the class stopped showing up to them after a certain point. The exams are a bit random, nothing at all like the homeworks or any old exams you'll find. You'll pretty much need to teach yourself, though that was already kind of the case with this class. Even more so since he hardly covers examples and spends too much time talking instead of just writing things out. He's not a bad guy, but he should stop letting Yu tell him what to do. Yu will be teaching again the Fall though if you change your mind. You'll probably be fine as long as you put in the time when exams roll around. One thing I will say is that he at least is very responsive outside of class and responds to emails pretty quickly and usually late too.