Verbal is Good, Quants is very vast

Verbal is recommended to all especially non native speakers
SC is very good. Meaning based approach to each sentence correction really makes a lot of difference while solving medium to hard questions.
CR was average. I mean some techniques were handy for solving hard questions but in general it was also helpful.
RC was below average. Nothing special was mention here. If you are purchasing this only for RC then I would like to warn you.
Quants was very extensive. For an Indian or Asian test taker you will easily get bored with the repetition of the content. For me It was not that useful. but for test taker with non maths or engineering background it might help.
At the end i would only recommend it for SC and CR, and if you are only buying it for quants then there are many other better alternatives available