I took Copenhaver for philosophy 3 in an online summer session. The material was challenging, but his online lectures were great at helping to interpret the material. There was also a video conference once a week with our TA, Ari, who I think was a key part to making this course so interesting. I'm not saying its a walk in the park. There is deep thought involved with the writing, so be prepared. Initially, I had low expectations coming into the course, being a science major, but the professor and TA made me an admirer of philosophy.