Although I'm not a fan of the obscenity, I love that his style has incredible detail. I personally like especially his drawings of dragons and animals. Since the book is in japanese, I can't read any of the text, unfortunately, but there is a translation online: http://pie.co.jp/english/10/1.php
If you like a more mature anime style with an organic feel and lots of detail, I recommend checking it out.
Nice collection of sketches and original work out of an exhibition. Not recommended for poeple who despise or avoid erotic art. The book is in japanese, but the dustjacket has an interview in english.
I love this artbook dearly. My only criticism is that almost all depictions of women are incredibly sexualized, objectified and fetishized. But his art itself is of course beyond stunning.