This is a brilliant adventure. The hooks are relatively straightforward, but presented in a fashion that would be easy enough to customize to any PC party to generate personal investment in seeing the story through. The design is elegant, fun, and contains a number of familiar wizard tower tropes presented in refreshing ways. There is sufficient NPC intrigue to allow the more political-minded players to garner enjoyment at various stages of the game. The opposition, while challenging, is not insurmountable. Once the adventure is complete, a number of potential aftermah scenarios are presented, giving the DM some guidance in terms of where the campaign might go from here.
In addition to the campaign itself, The Gleaming Cloud Citadel contains a number of new spells that are well designed, interesting, and add a new layer of utility to arcane magic without stepping outside of the narrative role of such spells, or becoming grossly overpowered.
I cannot recommend this HIGHLY enough. One of the finest adventures on the Guild!