Would definitely say this a highly valuable tool for anatomy study. It has stuff for illustrators, concept artists, and comic artist. I'm already planning on collecting more from this series
Section 2(Art) is probably the most valuable with understanding how light works on the human body. Section 1(Relax) gives basic poses to ease you into the study, and Section 3(Cool) gives more poses that look more designed for illustration. Section 4(Sexy) gives very submissive, feminine poses that work to emphasize femininity within your compositions.
Ai Hongo is also a great starting point because of her very balanced and symmetrical body type. It works as a great baseline and control body type. Your eye moves through her poses with ease.
My only critique is that Section 1 and 2 seem like a bit of a jump. I would say that Section 1(Relax), Section 3(Cool), Section 2(Art), and Section 4(Sexy). Or maybe I'm wrong and it was a purposeful tempo switch.
All in all would highly recommend.