I've only browsed through it a bit while watching Netflix, I like a lot of stuff in here, though I do like the idea of the first world and dragons with counterparts across worlds, it was interesting to read, I also don't really want to use it in my actual games. I'll be using great wyrms if my players ever get high enough level to challenge one, or maybe it will be something they interact with but don't really fight.
Loving all of the different dragons in the book, my homebrew world uses dragons a lot so I mill likely be throwing some of them into the mix, along with steel dragons since I've already established one in my setting.
It's a good book that I'll be using alongside the older edition dragon books, I should get a lot of use out of it.