I will not comment on the content of the book, because if you came here because of Traveller you know what you can expect and the book will deliver.
This comment is solely on the quality of the presentations as a PDF.
The first page is white with black text and no red bar. - At least for me it is disturbing not to have the covers pages.
But my most important concern is:
A 759 page book without PDF-bookmarks!
The index might be okay and is surely helpful if I had an paper-book my hands.
But for PDF user this this is horrible, I would never be able to memorize all relevant pages for quickly looking up anything during the game. And eBook Reader are not known for quick browsing, especially on a PDF.
And yes I could print out the table of content and the index.
Or I could make the bookmarks myself if the PDF was not edit-protected.
Also the table of content is wrong (Clones are at Page 96, Chimeras at 91, Basic Information has no page references at all and so on).
This is a sloppy PDF made without any love for the tree-saving reader.
[1 of 5 Stars!]