Hostile Acquisitions is another excellent entry into the Rogue Trader line of products. It is also an extremely useful book for Dark Heresy or Black Crusade because of its subject matter. The same laws and groups that will be faced by the Rogue Trader as he or she deals with aliens, bootlegs bolters and engages in piracy, will also be the ones that are enforced by Dark Heresy (where you can play as Arbites) and be fought against by the Heretics in Black Crusade. Hostile Acquisition includes tons of flavorful new equipment and alternate class ranks. The Nemesis Origin Path is incredible stuff. It's so nice to be able to create an adversary through similar steps to how PCs are created, and it really helps flesh out the characters. While it is a very focused book (none of the material will work if the PCs want to stay within Imperial law, especially because the alternate class ranks IMMEDIATELY make you an enemy of some, or ALL OF the Imperium) it includes so many neat details it is nonetheless, in my opinion, worth the purchase for any Warhammer 40k RPG enthusiast.