Well-written and logically laid-out, with more than enough to detail to spur the imagination in a million directions, but not so much that it constricts it. For DM/GMs, this is an invaluable resource for creating realistic, vibrant city-based campaigns that your players will love. For writers - particularly fantasy writers, natch - this is a MUST-HAVE for developing living, breathing cities that your readers will return to again and again.
[NOTE: The red cover seems to be from an earlier edition entitled Citycraft. This review applies to City Works, the blue-covered 2003 edition.]