Is It a good read?
It's hard for me to tell that about normal humans.
I'm a reading addict, and more strangely to real humans, a technical nonfiction reading addict. I ... like... reading textbooks. I commonly read "Machinery's Handbook" for maybe an hour at a time. Hot stuff in there about the correct rake angle and cutting shape for metal cutting tools and the heat treatment of phosphor bronze, not to mention allowances for press fit tolerances.
I liked it a lot. But I had already designed both power and audio transformers for a living for several years. There are passages where it says things like "Fit the windings to the available window, leaving about 12-15% margins", assuming that you know what margins are and how to fit windings to windows. Not to mention the stuff on longitudinal balance, which was new to me after years of transformer design.
I very much recommend that anyone who really wants to learn transformer design to first get "Transformers for Electronics Circuits" and RDH4. Once you understand the theory in TFEC and RDH4, the stuff in Wolpert's book will make more sense.