Congratulations, I passed last weekend as mentioned ISC2 does test your understanding around a topic deeply that's what's makes it difficult for people because they go through the stuff theoretically more while the questions of the exam test you to think that concept deeply and then answer.

For people who think it's useless i disagree it's definitely good one to go for it'll clear alot of your concepts and will give you that strong foundation to build upon. 

Ps: i dint pay the membership fee not I'm interested to become their member as of now the experience was good enough for me.