Professor Collins is, simply put, the best professor I have ever had at Columbia.
But if he's not your style, you will not have a good time in his class.
I had him for both methods and problems and epistemology, and the difference between a 120 person class and an 8 person class was huge. In Epistemology, Collins could actually get to know each and every one of us, and he was honestly interested. It's a tough subject to master, but he went clearly and methodically through every subject, making sure everyone got what was going on.
If you are a fan of syllabi and structure and knowing exactly what's on the exam, this is not the professor for you. Our "syllabus" was a list of topics that he wanted to get to at some point. He writes his exams the morning of the test, and if you ask him what's on it he will honestly tell you that he doesn't know. If that bothers you, don't take a class with Collins.
If you're a fan of philosophy and really thinking critically, this is the class for you.
This is the kind of class that will keep you up at night, not because you're in butler studying but because you're lying in bed thinking about that days lecture and wondering if we know anything at all.
Midterm, final, both very easy if you went to class. A few (3-4) 1 page assignments that can be tricky, but he allowed re-writes if you wanted. Total reading <50 pages for the entire semester.