In Mountain Witch, six disgraced ronin team up to climb Mount Fuji and slay the Mountain Witch. Yet each of them volunteered for a dark reason, the revelation of which would turn their companions against them. Bringing those dark fates to an Exalted scenario involving six dynasts on a Wyld Hunt was too enticing a proposition to pass up. It worked great!
The actual mechanics themselves continue to work wonderfully with very few hiccups. A minor issue came up when a player asked about creating a poison for his arrows, but it was satisfactorily house ruled in a flash.
It did make me wonder about crafting rules and poison though. So now I'll think about on how/if they should be included.