I have been studying for about 3 and a half months for PMP. i have been scoring good on the tests so far. Got about 80% on Oliver, 80%+ on Rita and Kim, 90%+ on Headfirst and I guess 75%+ on any free exam I have taken so far.

To the point, I took PMStudy free test about a month or so ago and got 78%. Took it again yesterday and got 90%. I have been reading a few posts and people keep saying in their LLs that buying the 4 PMStudy exams for 50 bucks was one of the best thing they did to prepare. Shoould I buy it? What kind of feedback do they provide?