Professor Balmer's 210B is tough, but I think it can be worth it if you are into abstract algebra. It covers everything from the middle of 110B to the end of 110C. It also covers Morita theory, projective and injective modules, tensor-hom adjunction, etc. The midterm is hard - the average was around 17-19 out of 50 - and the final's average was around 70%. He curves though. I would definitely work together with your peers. I like his kindness - I would take care to be courteous when I am interacting with him as he appreciates that. He uses his own lecture notes, which can be terse at times - if you find it a little difficult to understand his lecture notes, I would recommend Atiyah and MacDonald's textbook as a supplemental textbook.