Professor Ng is extremely clear. His lectures are extraordinarily well-organized, thoughtful, and clear. The assignments are interesting, relevant, and not too difficult.
After completing the course, I took MIT's open Linear Algebra course, and at that point was able to get more of the mathematical background. Professor Ng was very careful to present the material without much math -- impressive to say the least. However, once I got more of the mathematical background, I felt much more solid in my understanding.