I made this purchase to help flesh out the backstory and potential plot hooks for a character I created who hailed from Tethyr, the first of the three kingdoms detailed in this collection. And there's plenty of information to be found therein. As the content is 2e, the information is set over a hundred years prior to 5e goings ons. But it's still a great rescource for getting details on locations, history, and notable families. On that front, the product met my expectations.
There are four PDFs included, one for each kingdom, and one for a few maps. The maps-only PDF is ok. They're not super detailed, some are color and some are black and white. I don't think the maps included offer anything more than what is widely available on the web. The maps inside each of the kingdom PDFs are really disappointing. Specifically, the quality of the scans - which is what I assume they are - is like looking at a copy of a copy of a copy. They're still helpful in terms of getting an idea of the layout of a city and relative locations. But otherwise underwhelming.