This prof is definitely one of the best at UCLA. He makes analysis manageable for the students. It is pretty important to go to lecture because it gives you all the information that you need for the test and also sometimes hints on midterm or final questions. In addition, his review sessions before each exam are very helpful.

I have had Eskin for 2 quarters now (Math 131AH and 131BH), and I must say I have mixed feelings about him as a professor. He is definitely amazing in the sense that he lectures with no notes, has a great memory where we left off, and is able to clarify some difficult proofs. Sometimes, he is difficult to understand, and when you get lost in a proof it can affect your understanding for the rest of the class. His office hours are basically a way to either clarify things he did in class or get HW answers because he will do any problem you ask him. He is definitely a nice man and a man of few words. His grading is probably the only real difficult thing to pinpoint. He really doesn't seem to have any grading criteria and seems to randomly assign points with no explanation of why he gives you that score, so it can be frustrating to not know why you are getting points marked off. Also, the final grades are hard to figure out too because it seems that your performance on the final determines your final grade. I think he is a good professor but not the best I've had in the math department. If you have to take him, I'm sure you'll like him but just know there are better professors in my opinion.