A must have for a 700+ score.

A must have if you are aiming for a 700+ score.
Quant:
The best questions you will find anywhere. The explanations provided help strengthen your core skills. I have raised my Quant score from Q44 to Q49 using these tests. Don't place too much emphasis on the Score, as the Scoring algorithm might set you off. But, unquestionably these are best tests in the market for Quant practice and concept building.
Verbal:
The verbal section needs improvement. The questions were not at par with the actual GMAT's questions but still good for practice. Again, the explanations provided also needs more improvement.
Overall:
I relied heavily on GMAT Club Tests for Concept building.
The question types that I had noticed in GMAT exam quite closely resembled those in GMAT Club tests (especially quant.) The variety of practice questions in GMAT Club Tests is awesome!.I found GMAT Club Tests to be very helpful and critical in my preparation for getting a higher GMAT score.