I've been a rabid fan of Pathfinder for years. I read book after book, and desperately sought a game, but none of my friends played, and none of them were into epic fantasy like I am. Along comes Starfinder, and it has just enough chrome in it to lure them in. We're about to start the third Dead Suns book.
One thing we've been stumbling around is lack of setting knowledge. When I heard this announced, I drooled at the thought of the Inner Sea World Guide for Starfinder. I had loved the ISWG, it had plenty of juicy oliphant meat for a gm to sink their teeth into.
Starfinder: Pact Worlds is not the ISWG, and that's fine with me.
Starfinder: Pact Worlds is chock full of detailed information on each planet/planetoid/seedship/station/potential sleeping Great Old One, a bunch of new playable races, and a plethora of player-focused character options; including archetypes, themes, items, and spells.
This was not the book I wanted, but it is the book I need.
The ISWG was too meaty for trepid adventurers. Starfinder: Pact Worlds will be massively more effective at helping me intrigue, befuddle, and awe my players. It will give them the tools and the allies they'll think they need to surmount the infinite darkness.
Thank you, truly, Paizo, for not giving me what I wanted. You've done well by me yet again. I look forward to the next book, and the next, and the next, and the next, and the next, and the next, and the next.....