I thought about ordering it out of curiosity but I imagine it is mostly generic test taking tips for standardized exams. They have pretty much the same ad copy for a bunch of standardized tests (GRESUBJECT, AP, SATII, EMT, FTCE, etc. etc. etc. and I really mean etc.)
Even if it is generic advice then it still can be good advice because there probably are generic ways to exploit multiple choice exams but I guess my point is that I imagine their advice has very little to do with physics.
(Note: When we get a graduate school to sponsor PhysicsGRE.com
then perhaps I can throw a few dollars at things like this so I can try these types of things out and give a review without having to guess about what I am reviewing