Caitlin is very nice in person and helpful in answering questions that you have. Her lectures are terribly dull, though. Fortunately, all of the R files and slides that she covers in class are posted online so you can just download and study them by yourself. You still have to go to class though because you want to hear about announcements about in-class quizzes and take the quizzes. Groupwork makes HWs fun and easy which I really like.