Hi, Anon.
I made a 24 in Jan '08 and a 30 in May '08. I took a Kaplan course before my first MCAT, and the review class was not all that helpful to me. Also, I think I spent too much time on sample tests and not enough time on content review the first time around. The second time around, I printed the AAMC subject matter outlines for PS and BS and spent 100% of my time on content review. I also remembered topics that gave me trouble the first time around and made sure I had those down cold.
To answer your question, I do not think that a review course will help you unless you understand why you made a 24 the first time around. Was it content? Was it the format of the test? If it is possible, purchase the review books from someone (maybe someone on this site),and do your own, thorough content review. I don't think that spending $1700 for 3 nights a week of someone reading the review book to you will be that beneficial to you.
Just my 2 cents worth. Good luck!!