This game has been a source of many very entertaining campaigns. The rules-light story forward system allows for a fast paced game where it's truly friends writing story together, not flipping through pages and trying to find the right rule for every situation. I'm not at all surprised how much other material has been inspired by this system (I understand it's not the true original).
The balance of difficult complete success against partial or complete failure makes for story that isn't an easy walk through (although it can get there a bit at higher levels). The idea of success coming at a cost makes sense for story telling.