A great adventure - the Really Terrible School it's set in is super weaselly, full of horrific details, and extremely motivating for your players. The cast of NPCs are all tightly portrayed, full of grotesque personality, and easy to GM, and there's a heap of detailed material to work with. You can run this either as a traditional exploration/social game or using player-driven scene order, and there's ample support for either.
Also it's finely sprinkled with careful irony and a dash of black humour. Humour is really really hard in RPG writing, and this manages to thread that needle.
Would be fine to run in other settings too. Just wish the sequel was available...