I had some difficulties with this book, as the lecturer probably uses lots of pictures and illustrations. "As you see here..", "In the picture...", "Here we have clock A..." Fortunately the lecturer has so clear style in presentation, that it is possible to follow through examples without the illustrations.
AND where are the illustrations? As I have bought a book that uses illustrations, I would expect them to be visible. Can't at least find them in the Audible pages.
I would guess this would be good video lecture to follow. As audiobook .. leaves lots of room for improvement. As general book about theory of Relativity and Quantum physics, quite nice.