The book is well written. The language is lovely, very descriptive, and assumes the audience is both intelligent and well-read.

The artwork is gorgeous. I would have prints of some of the artwork, if I could.

The foundation of the story, trying to save the world from the 2012 demise interpreted by the Mayan adders, is excellent. The intricate methods of making time travel without making time travel are fascinating and curious.

This book needs serious editing. There are points that go on and on, in a rambling way. The main character goes off on tangents that don't add to the story, but detract the reader from a good story. This book could be about 300 pages shorter, with good editing, and be an excellent book.

There are bits of different languages thrown in (German, most notably) that are not translated and aren't adding to the story. The Mayan integration is good and the Spanish is somewhat ok (but not necessary).

Jed, the main character, seems to be an expert in everything (from ancient birds, reptiles, and plants to political climates around the world from various time periods), but the only thing he can think to call the contraption on his head is a toilet seat? It's incongruous with the character. His ethos is compromised when silly things like that are developed (and this happens quite often).