Expert Global Practice Test

Strengths:

1. Quants questions are most standard.
2. Data Insight questions are more difficult. It is very difficult to complete the section.
3. Verbal questions are very lengthy and not standardize.

Would make the product better:

Verbal questions should more standardized

Overall quants and Data Insight questions are perfect for taking preparation for real GMAT. Verbal questions are sometimes too long and hard and unstandardized.
Quants questions are more difficult than real exam but Data Insight part is hardiest. But If anyone can complete Quants and Data Insight section, then real GMAT exam will be easiest.
So, according to the difficulty level
DI> Qants> Verbal
according to standard level to real GMAT question
Quants> DI> Verbal
So, I am recommending to take the test.
Usually The main result will be 20-50 points better than expert Global Practice Test.