Apparently, Ozer is one of the professors who does not demand a lot from his students. If you want to learn - you will learn, if you just want to pass you will pass with a minimum effort applied. At the same time he is really passionate about teaching, invests a lot of time into that, and makes good accents on the topics that you will need to pass EIT. His classes are certainly useful, I strongly suggest you be there so you could follow the material, look into the book sometimes and you will do well. Usually students who complain about his teaching are the ones who skip classes during the semester and one week before the final puzzle themselves with a question - Now what? And take some time to see him during office hours - he is a great guy to talk to.