I got GMATCLUB tests by paying for the 6 month subscription back in 2014 but then I had to extend the subscription for 50% off (due to premium membership) as I had to push out my GMAT plans for 6-8 months later. I think everyone considers Bunuel one of the best GMAT Quant experts if not the best one. He has compiled some quality questions in both his signature collections and the GMATCLUB tests.

Pros:

1. Excellent source for targeted practice (by difficulty level or by topic/sub-topic).
2. Useful to review questions that you got incorrect or spent too much time on.
3. Ability to select just quant or verbal separately to evaluate if you manage your time well for 37 or 41 questions in 1 practice session.
4. Ability to select number of questions in a given practice session, timed/untimed.
5. Interface is very similar to what you will get in actual GMAT. This familiarity to the interface is a very important aspect of training yourself for the real thing.
6. Interface for the practice/mock CAT gives you the same options that you get in GMATPREP (pause the exam if you want to, same shortcuts applicable as those in the GMATPREP software etc.)
7. Great number of questions for both verbal and quant.
8. Great pricing and collection of perks that you get with GMATCLUB test subscriptions.


Cons:

1. Although @bb and @bunuel have gotten the algorithm tweaked a few times, but I felt that the algorithm wasn't really adaptive when I chose to go for quant only CATs. I saw majority of the questions (sometimes 34-35 out of 37 as 700+ level questions). IMHO, GMAT throws a lot more of the other difficulty levels to come up with the correct sectional score.
2. Verbal for GMATCLUB tests still lacks good quality questions and as such I stayed away from the verbal questions in the GMATCLUB tests.

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GMAT Club test are a must for the quant prep. One must attempt at least 15 quant tests here before one plans to give their actual GMAT exam.

Though the scoring pattern is not accurate. One should gauze their performance by the number of correct attempts.

Just to make it a little better, the test should also reciprocate the actual GMAT style questions because some of the questions that the exam throws are way "not like GMAT" (IMO).

The analytics part of the exam should also improve. It doesnt show case ares of improvement or otherwise.

Be relaxed with the scoring as it might hep in boosting the confidence of the students by seeing a better score but that doesnt mean to inflate anyone's ability.

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