Prof. Scheaffer is a wonderful lecturer. He is clear, concise, asks the class if we have questions, and is even comedic at times (very rare for a math professor :P). The homework assignments were challenging, and were graded for correctness and it was hard to get 100%. The two midterms and the final exam were fair, with averages in the low 80s. He told us exactly which proofs and theorems we did and did not need to know, and even repeated some homework questions on the exams. He holds regular office hours, which I found helpful.

Still, 115A is a difficult class, and I cannot imagine how miserable I would have been if I had taken it with anyone else. He did not curve the class this quarter, and you do need the textbook (not necessarily the UCLA edition though). Good luck!