Personally, I don't think any one review book gets it "completely right" or is very very similar to the real PCAT exam.
I've taken PCAT practice exams from Pearson, ARCO's, Peterson's, Mcgraw Hill, Cliffs, Kaplan, Kaplan class, MAT, Barons 4th and 5th editions, REA flash cards.
Obviously, the makers of PCAT, Pearson and its 2 online practice tests are the best but is still different from the real thing.
Keep in mind there are 8 experimental questions in each section and some of those questions may catch you off guard. I hope those were the questions I skipped and guessed on.
In regards to Cliff's, their chemistry section was the hardest for me. They require test takers to refer to the periodic table at the end of the book when the real exam does not require this task. All in all, Cliffs helps me recall lots of important science and math skills, and sharpens my test taking skills in terms of time management.