This is an amazing Mothership supplement!  I have found these rules invaluable for creating derelicts and handling salvage for the PCs!  Turning derelicts into "space dungeons" and translating dungeon-crawling rules and procedures is genius!  I love this supplement so much!  It has its own unique setting and lore, but the systems are perfectly serviceable in campaign frameworks.  And it includes a great monster creation system???  This whole product is an incredibly useful package for a Warden.  Can't say enough good things about it!  The "I search the Corridor" DLC expansion really rounds this out to give you a complete package.  There are other derelict and salvage supplements out there that I enjoy, but to me, this is THE salvage supplement.  If you only buy one of those, THIS would be my strongest recommendation!  Love this!