Ethan is a wonderful professor. Classes are interactive and interesting, and he clarifies any and all questions students have. M20 (same as CEE M20) is an introductory course, and the pace is as such. There are no exams but rather 8 homework assignments (weekly basis), and a final project that you have ~3 weeks to complete. The homework is 50% based on your code, and 50% on your report. The reports are mundane and long (~8 pages), but halfway through the quarter he told us to shorten our reports since the graders didn't want to read so much. Lectures are taught by Ethan are once a week, there is a discussion taught by a TA once a week, and there is a lab section once a week taught by your specific TA. Normally there are three problems per homework assignment, and at least two are gone over in depth during the lecture and discussion, so homework is never too difficult if you go to class or listen to the podcasts (lecture/discussion only). I would definitely recommend taking this class with Ethan!