I found Kang to be one of the easier physics professors (after taking Corbin and Vassiliev for 1A/1B). Personally, I didn't click with his lecturing style, but reading the textbook and completing the homework problems was enough to score highly on his tests. Even if you do go to lectures, I would still recommend reading the textbook, since the homework problems come from it.

The midterms weren't difficult except for the time limit. The problems were easy, but you had to work fast to complete them all. Kang did take student feedback midway through the quarter though, and he expanded the time. The first midterm was only 30 minutes, the second midterm was an hour and a half, and the final was 3 hours. Averages were pretty high, but Kang doesn't downcurve. Definitely recommend.

Kang is very clear and organized with his lectures and actually made me like physics. Tests were fair and the curve was generous. Would take a class with him again.