before mcat frenzy started i was certain i wasn't going to use a prepcourse. i had heard that the classes were useless. what swayed me was a friend who put it to me this way: basically a lot about test day is feeling confident, and you don't want to look at your classmates and feel insecure that you didn't do something which may have helped. almost everyone around me was taking it, and though i hate to do things just because everyone else was, i figured this wasn't a time to make some sort of misguided intellectual statement (only applies to myself). its an expensive security blanket, and i'm sure that those self-motivated people will (and have)do well regardless. the classes were useless, the materials, though off base at times, were quite helpful in retrospect. but if you get enough materials, and feel confident that you can handle it, either will lead to your success if you work hard. goodluck.
-jot