Not too easy. Not too difficult.
I would recommend this course because it truly does challenge your problem solving techniques and forces you to learn new ones. The learning process is similar to that of your first physics course in that you have to look at a situation different from the way you normally would. That's what I really enjoyed about this course.
I learned Naiver-Stokes Equation and how it can give you almost any type of information you need about the problem, like acceleration, pressure, velocity in any direction, etc.
Hours per week:
Advice for students:
You need to go to office hours and the TA sessions, unless you're some prodigy. But since most people aren't I recommend you go. I rated this course as not too easy/not too difficult because I went to those sessions. If I didn't and tried to do it on my own, it would've taken much more time and harder to understand.