We used Risus for the short Law and Orcdum PbP game, that's the only experience I've got with it. But I love the system's build and openness so yeah, I'd like to use it for some stuff in the future. Makes a good one for a pick up event. OH, wait, I used it in that Not Lost PbP game I did too. Heck, twice is more than I've used half the game systems I own.