I have enjoyed this product so far, it actually includes more than I originally expected. I thought it would just be compendium of Expanse ship description and deck plans. That part is actually roughly only half the book. The first half includes several chapters about life on ships, extra ship rules and how to modify/design a ship. It's very thorough, with a nice layout and neat illustrations. The deck plans and ship descriptions are beautifully designed. I removed one star beccause the deck plans are not really usable for tabletop or VTT RPGs (they pixelate pretty fast if you enlarge them). I would really love to have the deckplans as high definition .jpg or .webp or .png, so they can be used by GMs during their games.
Edit: dropping the rating to 3 stars because of the unresponsivness of the publisher to fix the issue with the PDF (ie being so low res that the maps are almost unusable for tactical purposes).