If anyone wants info on either program let me know as I just finished them. I first did the MSP then the IMS. The MSP program is harder to get into do to the small class size. If you applied early, had good letters of rec. and demonstrated a pure determination for medicine during your interview you have a good shot.
As far as competition, there is none. I completely disagree with TexasGuy41 in this regard. IMS is very hard and there is a feeling that everyone is praying to do well, however you are not graded against each other so people generally get along very well. You grade is determined by the Drexel med school mean. So, if the mean is 86.5% in Biochem and you get an 86.6% then you get a B. Some classes most of the IMS kids do well and if everyone kills the average well then everyone will get A's (this will NEVER happen though).
I would just add that this program made the world of difference for me and I am HUGE fan of the MSP program. I would HIGHLY recommend it to anyone who needs to boost their MCAT score.
If you have any questions feel free to PM me. I found out about this program through a very generous person and I feel obligated to help people who are in boat I was once in. Also, if you do PM me seeking advice, tell me some stuff about your applicaiton.
Best of Luck,
WISC-ite