Solid read. Product delivers on the promise of a system-agnostic, fleshed-out-but-open-to-your-intepretation setting with plenty of adventure hooks and characters. The author's have achieved a good balance in this setting: believable yet compelling, unique but understandable. The quality of the included map is high and understated; it was a welcome change from the overly-washed, crammed "mad painter" portraits in other products I have purchased.
Character and locations profiles were digestible but detailed. I don't need a 10 paragraph summary of a character or place to make use of them in my game. You get a strong impression of the setting elements in 2-3 paragraphs each, with plenty of room to add your own flourishes as a GM. Overall, the writing was clean and of a high quality.
This was the first Cities of Wonder product that I purchased, and the quality of it led me to purchase several others.