I really think Colin and alfarom's reviews nail this scent. Industrial, natural, geometric.
I think it might be the pepper that gives an almost concrete like aroma at the beginning.
As alarm says, simple but not simplistic. All of the notes are laid out there and easy to see, but there's something about the interplay of what are really very familiar notes working together in a way I've never come across before. The cypress/grapefruit lasts from the opening throughout most of the scent's life, and its interplay with the iris and other notes teases, giving hints of something more floral that I can't quite put my finger on, leaving me fascinated and frequently coming back for more.
I get good longevity from this by CdG standards. Definitely a unisex scent that can be comfortably worn by anyone. I love Hinoki, but I think this is the best of the Monocle series.