I have a friend who took this prep course last summer and she mentioned that it was a good intro and refresher to classes she hasn't taken in a while. This is what she actually told me,
"I did take a class offered online through UMKC as an intro to subjects I haven't taken in awhile. It was a great intro to studying for it, you have the lectures available for three months and can email the teachers for about a week. Also with your purchase you get TopScore, which is three full timed practice tests."
My friend really did improve her DAT scores the second time around. But I don't think this prep course was the sole reason for the improvement. I'm sure this course helped her refresh some of the topics and she put a lot of time (about 3 months) in afterwards with the DAT destroyer and the Topscore program.
I haven't done any personal research about this course but if it does come with Topscore like my friend said then I guess you can think of it as getting a $60 program for free. 🙂
Hope this helps!