I read all the reaction papers before class discussion and then use them to integrate students' ideas into my discussion questions. This means that I am frantic before class, reading as fast as I can to get through 15 to 20 papers, but it is always worth it. I walk into discussion knowing what matters to the students, what information is new to them, and what is confusing. The big payoff is that the response papers give students confidence during class discussion. They have already started to digest the reading, and they have my comments and questions in the margins of their papers to push their analyses further. Student evaluations at the end of the semester usually mention the response papers as a real opportunity to think and define the course.