Very accurate in scoring, and good for practice

I have used for a very long period of time GMAT Club Tests. For my preparations for my latest exam, I have used GMAT Club tests for practice, especially the quant ones. Needless to say, the "predictability" of the tests is outstanding. I had been constantly getting 47-49 on Quant, and I got 49 on the real test.
Just as MGMAT CAT's quant sections are, so are GMAT Club's quant tests in terms of "difficulty". Tests are more "difficult" than the real test, yet studying on "hard mode" makes you more vigilant (most of the questions rely on basic concepts, the mastering of which is crucial in getting a high score).
I really appreciate the effort that was put in creating these tests, as I have noticed that each question CAN be solved not just in 2 ways, but some times in 3 and more ways.

Verbal tests are accurate as well. I scored 30 on the real test, while getting 30-40 on the GMAT Club's tests.

Are the tests worth it? I say yes. Nonetheless, the possibility to buy tests with kudos gives everyone the chance to try GMAT Club's CAT's.