I have over 30,000 students registered in my four video courses that I host on Udemy, the most popular video course marketplace on the web. Udemy has a very robust student feedback and course rating system, which is obviously important in a course marketplace, but also helpful for instructors to see what's working and what needs improvement. I'm happy to see that my courses have a lot of positive reviews from paying students on Udemy. Here are some with concrete feedback.