This may be my favorite GW book release since the 2nd edition Eldar book.
There aren't any Dark Eldar or Harlequins in the book, but most of the Craftworld units appear. The artwork runs from 1989 to 2013.
The notes themselves provide insights into how units were originally envisioned, such as a much beefier Hemlock load out, sporting a D-cannon in the place that eventually became the Mind Shock pod.
Not to mention the little inspirational touches that can be applied to your units for building background:
When flipping through the book the look and feel of the pages gives a sensation like you're flipping through his actual sketchbook, as if you could smudge the pencilling on the page.
In all it's a top notch product and I highly recommend it to anyone that has a chance to get one, and for most Eldar fans it will be an instant must have. I wouldn't be surprised to see it pop up on eBay for a king's ransom.