It is probably the sign of a good professor that they are producing their own course material rather than just telling students to go and read a certain text book chapter. That material is what they think is important and is in their own style, if that style clicks with you then great, if not then you're out of luck. With text books, you get everything, not just what someone thinks is important and you can go to the library and find one with the right style to suit you. I still have all my text books, and I actually do use some of them occasionally if I need to revise some topic.