excellent guide. well balanced on the coverage of the different sections of the GRE. they also do present different essay samples and the grade each essay received which was extremely helpful in understanding how essays are graded.
the guide though doesn't provide strategies for solving verbal or quantitative questions which might be disappointing for some yet they present their answers to sample questions in a very compelling way and they provide more than a single solution method when possible so after a while you'll start to develop your own strategy for solving GRE questions
still, I highly recommend listening to Magoosh lectures while working on this quide.