My class was challenging, but very fun. I found that the concepts were intriguing (excluding dumb Magnetism). As long as you understand the concepts of how you're applying the equations, you can get high scores on the AP test. To put things in perspective, I'm a 790 SAT II Physics guy without studying and a 5 on the test.
In my opinion, it's much more interesting than Chemistry since you can literally see most of the concepts apply in real life. If you enjoy Math, you'll definitely like this course. Not so much if you're a history/english buff.