Keep in mind most regions only get two pages. Two. Two pages to describe a country. Not enough for me.
Let me be the dissenting voice here. I get the kitchen sink approach is the best way to make the biggest number of people happy. I don't like it but I get it. My recommendation is instead to focus on a specific region and delve deeper into that instead of the campaign setting book. For example, get the
Cheliax Companion and instead have 32 pages devoted to the region instead of the 4 pages it gets in the PFCS. Add to that the
Council of Thieves AP (6 issues long),
The Council of Thieves Players Guide (free) and you're good to go. I admit, much of that is not setting material but I do believe you will get to know at least part of the setting a lot better than you would with just the PFCS.
Another example is Katapesh a region of Golarion. In the PFCS it gets two pages. Instead you could buy the
64 page Chronicles Guide on the region,
AP with the adventures that take place there and the
32 page Players Guide.
In the end I guess it depends on what you want. If you want a very, VERY high level look at very, VERY large area with not a lot of detail so you can give it your own then the PFCS might work for you. I found it lacked detail, far too vanilla and kitchen sinkish in the extreme but that was the design goal so I guess they achieved it. There is a lot to like but I only started enjoying it when I got a much more zoomed in and detailed look at the different regions in the supplements.
YMWV.