Definitely Helpful....Highly Recommended

Quant questions are up to the mark, with 700+ level questions imitating the hardness level as faced during the test day. CATs user interface and the timer resembles the actual test interface and thus provides a before hand feel of the actual test setting thus minimizing the 'surprise factor' on the actual test day. Instead of having a separate question pool for each test, GMAT Club tests have a very large single pool of questions, thus there is no reason to reset each individual test. Unique questions and each question has its own analytics and shows you details about your performance and also that of other test takers.
Highly recommended.