Do is a solid teacher and I definitely wouldn't avoid him, but that being said he doesn't make the class super easy. His homeworks are on the more complicated side and he goes pretty fast in lectures so you definitely have to read the textbook before hand. I'm not sure he is very good at explaining concepts, but he does do a good job teaching by example so if you like that learning style then going to class is very helpful. The exams were very fair and well written, they incorporated pretty complicated examples from the homework but everything was doable and basically what I expected, and there's also a midterm drop scheme which is nice. I didn't think the class was super hard grading wise and I would say if you were fine with the other lower div maths you'll be fine, but I could see how Do would be tough to learn from if you were less into math. I liked him overall, he is a nice guy and super smart and I feel like I learned a ton from this class.

I liked this class a lot - I thought the professor was a good lecturer, and the lectures themselves are very clear and well-organized (though unfortunately not recorded). The homework is graded on correctness but generally weren't too difficult, aside from a few tricky problems. We had two midterms and a final - in terms of exam format, the questions were all fairly straightforward and similar to those in homework/lecture, with the exception of each exam having a question subpart (usually worth ~5%) that was noticeably harder than the others. I didn't attend many office hours personally, but the professor would almost always be going over homework problems.