I'll separate this into two, as I used this both as a textbook for a course as well as a "for fun" reading after that.
As a textbook: it's great, there's none of the "as we can very clearly see from this equation"-nonsense that is frequently present in physics textbooks, everything is explained both mathematically and in layman terms, there's plenty of graphs to illustrate the points in the text, and the exercises were fun and challenging in equal measure. Got an okay grade from the course thanks to the studying process being so pleasant.
As a "for fun" book: if you're okay with algebra and familiar with classical mechanics as well as concepts from general relativity, the book reads almost like a normal popular science book.
The only thing that occasionally got on my nerves was the never-ending barrage of dad jokes scribbled onto the footnotes. On a good day, I'd ignore them - during a rushed busy exam season where I wanted only the answers to the remaining questions, seeing one brought out the ancestor ape from inside me and prompted rather primitive thoughts of flinging stuff.