Hector is a great professor who really commits to his teaching. Although occasionally I find it a little difficult to follow his accent, in general, his lectures and coursework materials are really helpful for someone who wants to construct a sound basis for calculus. What I like most about his class is that he has a lot of bonus questions in the homework as well as exams, which can boost your grades up to 50%. Even for a lazy student as myself who never starts doing assignments until the last minute, the outcome of homework and exams were very well. BTW, Prof. Hector likes to use graphic tools in homework, which is really helpful to build up a graphic understanding of Calculus. He also gives us a lot of supplementary materials like history of mathematics (not a must-do, though), which I find both fun to read and learn.
During office hours, Prof. Hector is very laid back and likes to help students with their questions. He is not the sort of instructors who will ask how're your parents doing, but he is really friendly and tend to foster a close personal ties with his students as long as you are willing to ask him.