Incredible experience (specially with rigour of questions)

I would like to review the GMATClub Tests in terms of two parameters-

Disclaimer: I have taken a few untimed tests (yes - a great function to use the flexibility of taking test timed or untimed.)

Content- I liked the rigour of both Quant as well Verbal CATs. I hope it was on a tougher side compared to the real GMAT tests as it has the majority of questions of 700 level.
But I would have liked to see a comparable score based on the difficulty of the question.

Functionality- The MY PERFORMANCE tab has various super useful functionalities such as creating a custom quiz out of attempted test, sorting and filtering based on various parameters and etc.
An option with combined verbal and quant test would be like a cherry on the cake.

Thanks