Remarkably detailed, which turns into a double edged sword. On one hand it introduces notions that aren't commonly found but on the other there's a reason these notions aren't that common haha.
Would recommend easier books for people new to the field, like Neil DeGrasse Tyson's Astrophysics for people in a hurry, but if you know quite a bit and are looking to dive into more details, this book is for you.