i've heard mixed things about the kaplan course. 2 of my friends took it, and did worse than me on the DATs. other people have taken it, but say it is only useful if you really do the work that comes along with the class, and review it on your own, too. i didn't have the 1400 to spend, so i bought the kaplan book and various online practice tests. i did just fine on the DATs by teaching myself.
..so moral of the story, figure out how you learn best. for some people, it takes others to teach them, but then you also have to put in the work. for me, i learn best when i teach myself and constantly look at practice questions. (this was also the way cheaper route). as long as you put in the work, you'll do great! GL.