This Space Marine Codex for the tenth edition of Warhammer 40,000 follows the same basic structure as previous Codices with background and rules section but with two Showcase sections, one for ‘Eavy Metal painted models, the other painted by other Games Workshop staff. There is also a guide for painting the Space Marine Combat Patrol as Ultramarines.
As with the tenth edition Codex: Tyranid, a lot of the lore in the background section is copped verbatim (even including the same pieces of art in some cases), even when it references some units that are not part of the official rules this edition. There are some new pieces of lore in places, and these are mostly good.
The rules section of the book is also in line with the previous codex released for this edition, containing Combat Patrol and Crusade rules alongside the Datasheets for all the playable Space Marine units. Of these rules, the narrative Crusade rules are the most interesting as, in addition to giving them the usual faction specific Battle Traits, they allow players to promote characters and squads through the ranks of their Chapter. The rest of the rules are pretty standard for this edition, simplified from the previous edition and, in my view, with a little less variety.