Sequential Tart has a very well researched review, brings up some interesting background.
“The story stands the test of time, partly because it is a catalogue of classic pornographic and Sadean tropes (Susan Sontag called The Story of O “meta-pornography”), but also because it has a purposely retro feel. Crepax gives the comic a flapper-era aesthetic that calls upon a timeless, iconic era of libertine feminism.
Crepax, who was a successful advertising illustrator, also knew the power of suggestion. While he does not shy away from explicit depictions of sex and BDSM activities, he also knows when to pull back and let comics do what they do best: allow the reader to imagine what happens between scenes, just outside the panel, in the next frame, or elsewhere on O’s body.
The true selling point of this edition of The Story of O is the production. Printed on a bright white, opaque stock, Crepax’s linework comes to life, with the flow of ink, the physical weight of the hand and turns of the wrist evident in every line. The NBM edition of The Story of O is a solid, very reasonable priced standalone volume.”