Just got access to the CBT. I'll update this post with the first impression (I don't see any embargo or content restrictions so I can only assume it is safe to talk about CBT's content).
Update:
Yeah, I think it's not for me, mainly cuz I really dislike the gameplay and everything around it, which is a mix of RTS and Tower Deffence. The story and the world is really interesting, though, I wish it was a different kind of game closer to ZZZ or HSR gameplay-wise.