I used this book as reference throughout the first three years of med school. I haven't read it through, but have read a fair bit of it.
It was good for outlining the detailed steps in various processes - e.g. development of the heart and gut - that I had a bit of trouble visualizing. It was especially helpful during my clinical rotation in pediatric surgery, as I could read more about how the normal processes of development occur and contract those with how/when/why things go wrong and what results from that.
It uses a lot of pictures to teach concepts, though I still found some sections confusing and wished there had been more (I used youtube to fill in the gaps for visualizing the processes).
I enjoyed reading this book more than most textbooks - the information is presented in a way that increased my interest and curiosity in the subject.
Overall, it's a good book for students learning embryology and development, and I think would be a helpful resource for those in e.g. pediatric surgery, though they would probably eventually need a more in-depth resource.