I took Powerscore. My score went up 12 pts from first diagnostic to test day. The course is not exactly like the bibles. I had the bibles first, and I might have been able to do it myself in LR, but not games. The LG Bible does not have enough examples.Honestly, I needed someone to walk me through it and then pound it into my head--that's what you get from a course.Plus, you get soo much more material than is in the bibles. The design is the same, but you get more--and you get people to interact with and help you analyze your mistakes. I hear testmasters is just as good...but do take a class!
I have looked at the 3 major test books. Kaplan, Powerscore and testmasters.