I always figured I'd take the course, since I took the Princeton Review course for the MCAT and it was incredibly helpful. However, I've realized that the MCAT course was helpful because my "premed courses" didn't cover all the material I needed to pass the test, whereas my med school courses teach to the test- to the point that since the boards don't use questions like "all of the following except..." neither do our tests. I've also discovered that I'm a much better self-studier than class-goer (I go to class once every 3 weeks or so for review sessions), I'm probably better off sticking with what works for class than trying to change study habits for the boards.