Whether you're studying for the SAT or the MCAT, Kaplan Test Center has instructors who'll help you study for the test. Don't get me wrong, the instructors are very capable. But I just feel the class wasn't very helpful. I took Kaplan for GMAT and I thought the class wasn't very helpful. Just buy the Kaplan book and study from that because they'll just repeat (sometimes verbatim) what's in the book and since they're on a time schedule, they're rarely available to help you after class. Save the money and buy yourself some Kaplan/Princeton material to study. With the money that you would have otherwise spent, you could probably even hire a private tutor.

PROS: Motivates you to study
CONS: Useless