I took this class with him in Spring of 2013. He's a great guy and is really intelligent, but I did not like his class at all. The class material was already very difficult, especially for first timers in proofs, and this professor just rushed through the material day after day. I don't think I learnt anything from him. To be fair, I heard he was new to UCLA then, and I pretty much gave up on this class by Week 4, so it was a pretty horrible experience. Still, I never felt so lost and discouraged by a class before. I really wish I took this class with a more experienced professor.