I think the in class session for Kaplan is useless. We had one, yes only one, actual professor that taught the class. Other instructors were students that did well on the MCAT's. Some read word for word from the Kaplan text, while other instructors were learning a thing or two from students in the class.
I would just pay for the online course (I think it's $500 vs $1100 in class fee).
You can get tons and tons of practice ques online, and watch online videos of each topic covered in depth. Also, they have awesome workshops for each topic covered on the DAT.
Still, I would buy topscore, that is closer to the DAT than any Kaplan exam.