The course material was very interesting, and I felt like I learned a good amount of material. Tests were not always representative of homework, but they were definitely do-able and fair. It was a lot of work getting all the homework done, and since there was no TA there was no way to know if your solutions for ungraded homework was right. The take-home final was pretty difficult. His office hours were good because he's very friendly and offers tea and cookies. I'd say take him, but be ready to spend a decent amount of work with homework and stuff because he seems to like to assign a lot of homework every week. But, he really isn't a 9 difficulty. I'd say lower because if you put the effort in, he will reward you.