The instructor uses "uh...um...uh..." really, really, really a lot. Later, when I have time, I want to count how many times he uses "uh...um...uh...." in one lecture. But the quality of the lecture is not good either. The explanation is so scattered that I couldn't understand it no matter how many times I watched it. I bought it with high expectations because it was a famous person, but it was a lecture that fell short of my expectations. I want the students to think about why they paid a lot of money for the lecture.