The presentations focus directly on core material being tested on the MCAT exam, so it trims alot away that I don't need to focus on if I were just using my college course textbooks to review. I like going directly to the particular topic I'm working on within my study plan, and this tool allows that type of easy access to review core concepts. It's also nice to take the reviews with me, so I can study in blocks of time that fit my schedule - whether it's at the library, home, etc. Just started downloading the files for a specific topic onto my memory stick as needed so I hardly even access a disc except at home, just need a computer with a USB port to study the MCAT review at the library!