This class destroyed my soul. The lectures are very boring. I had to scotch tape my eyeballs open to stop from falling asleep after 20 minutes. The grading is ridiculous. I could go on forever about how this class was a bad experience and made me want to drop out of college, but in short, there are other ways to fill the pre-rec requirement that it fulfills, don't take this class.
He's a really good lecturer. Try not to say anything when he squeezes his eyes shut and thinks, because it will just delay his response. His TA's are tough graders, but probably on his command. He is pretty funny, but he realizes that he isn't a comedian so he doesn't try to keep us entertained all the time. He's patient but can refuse to answer a question because he'll go over it later. I had him over summer and during summer, he spent the first half of the class going over what we covered in the last half of the previous class. So, clearly, he's thorough. The homework is a free grade bump, don't be an idiot and do all of the homework. Would I take him again? Most definitely. I'm just not a fan of Greek philosophy, so I won't sign up unless I have to. But if Kelsey is teaching the class, I'll be there.
Kelsey is extremely knowledgeable of Greek philosophy. That being said, he expects a lot from his students. Unlike other professors that tell you just what the greek philosophers are trying to say in their texts, Kelsey tries to make you grasp the material yourself. That doesn't mean his lectures don't help you--lectures will only give you a broad understanding of the subject, so that in order to really understand what Kelsey's trying to explain, you have to peruse the text. If you like a good challenge in philosophy, you should definitely take this class. He's a great professor.