It depends on what option you choose - you can look all of them up on the Kaplan or Princeton websites.
I did the Kaplan on-site course thinking that they may provide me with some super insightful ways to do better on the test, but was pretty disappointed. The instructor was some kid who had just taken the MCAT and was in some of my classes. He largely just read out of the book, and couldn't answer most questions that weren't pretty basic. . . . likely because he had the exact same level of education as most of the students that were asking the questions (I'm sure he was very smart, just underqualified for this job, IMO). I eventually stopped going to classes, as I found that I was much more productive using the time to study on my own.
On the other hand, I did find the materials, on-line tools and practice tests very helpful. So, depending on your learning style and time management skills, it may be better to get one of the on-line options (and about $700 cheaper).