For someone looking to build convincing detail in their urban setting, GUILDS is a marvelous tool. Historical background, fundamental guild types, new NPC classes to enhance specialization, as well as the one-three page descriptions of various guilds stimulate the imagination. Would not recommend for PC consumption, unless playing a high-level urban campaign. As with any good support document GUILDS provides a few new magic items, a few new prestige classes and a couple of unexpected monsters.