I did take the Kaplan course and I found it useful for the following reasons:
1) I'm 7 years out from undergrad, and I was in serious need of a refresher course.
2) I'm working full time right now, so the class-room type setting helped me stay on top of things.
3) The instructors really knew the material, and they were very helpful when I had questions.
4) Not being in undergrad with other pre-opt students, the classes introduced me to several other students to whom I could turn for assistance.
5) They overprepare you for the test. If you can stay on top of (or close to it) all the reading assignments, practice tests, quizzes, and reviews, you'll be in great shape for the OAT.
6) They suggest several test taking tips that actually worked for me on test day.
Here are the things I didn't like about the class:
1) Some of the material was pretty shallow when I thought a more in depth review would have helped us retain the information better.
2) Not all instructors are created equal. I think they all knew the material well, but some were much better than others when reviewing for the class. We occasionally had no-show instructors and class was cancelled. The classes were always re-scheduled, but for $1000 you expect more. And one instructor inserted his religious beliefs into the evolution review. I am in Alabama, so I probably shouldn't have been surprised.
3) This is a minor quibble, but the reference materials for the OAT frequently and incorrectly mentioned the DAT and the MCAT. I can understand that there's a lot of cross-over so they wouldn't really re-write the book for each test, but a quick find-and-replace would keep the materials consistent.
There are some aspects of the review course that were less that wonderful, but overall I thought it was money well spent.
Speaking of money, consider the return on your investment. If you really keep up with the course work and it pays off with OAT scores that will help you get into optometry school, then is $1000 really that much? Also, I think Kaplan does offer reduced rates if you can demonstrate need.
So, if you would like structured review course with knowledgeable tutors, a large amount of focused study materials, and numerous additional reference materials, then Kaplan might work for you too.
Oh, and here are my scores:
TS: 360
AA: 360
*not a paid advertisement, just one guy's opinion*