Comfortable. Doesn't really challenge me, but is useful to others. Very, very, popular. More of a conceptualist.
Class with Chris is always fun.. he's hilarious. Class is mostly discussion-based, outside work is reading and maybe a few papers, and it will definitely make you think.
Chris is a good teacher.. most of the outside of class work is reading, or a final paper. Classes are generally lots of fun, and make you think.