A perfect companion to the Lost Omens World Guide, as I'm sure it was intended! Between the loads of heritages and organizational archetypes, this book serves the singular purpose of giving players ways to tie their characters into Golarion not just through flavor, but through mechanics, which is one of my favorite design elements to see in RPGs.
Using the Lost Omens Character Guide to make characters inseparable from the world they inhabit (down to when and why they roll dice) is sure to enrich whatever a GM cooks up using the Lost Omens World Guide. Between these two books, I could run campaigns in Golarion for the foreseeable future and practically guarantee player investment.
I'm brand new to Golarion, and this book gave me a superb high-level overview of the setting. The hierarchy of content in this book (i.e., zones; regions; places; histories; current events) makes it very easy to access information without getting overwhelmed or lost.
Overall, a very functional book with plot hooks simply leaping off the page! I would get a lot more mileage out of setting guides for other games if they were similarly structured.
Additionally, if I wasn't already a Lost Omens Subscriber, I would feel that this book in conjunction with the Lost Omens Character Guide would be all I needed to run substantial campaigns in Golarion.
I entered the RPG hobby at 4e and transitioned over to Pathfinder after Essentials came out. Then, I jumped from Pathfinder 1e into 5e, because the flaws Pathfinder inherited from its predecessor (3e) (i.e., the infamous "Ivory Tower" game design) could only be concealed by a shiny, new veneer for so long. I soon grew disillusioned with 5e, which I felt was flimsy and bland; I got all the mileage I could out of it in a very short time.
I never truly got over 4e, and I missed Paizo's unmatched prewritten content support; it's for these reasons I picked up Pathfinder 2e. It's almost as if Paizo said "we beat them at their own game for 3e, let's it for 4e too!" Jester David said it best in his review that PF2 "should appeal to D&D fans who are unhappy with 5e’s 'rulings not rules' attitude and want a game with less arbitration and firmer rules. It should also appeal to many fans of 4th Edition who might be in the market for a new game."
Between all of this and Paizo's continued dedication to inclusivity and helping players foster safe spaces at their tables, PF2 is hands-down my new dedicated system.