The generic RPG system without a fixed setting, convinced me above all by its generic exposure with the system is basically and literally truly anything is possible.
The player characters are always on top of the system established history and characterize this decisively.
During character creation, the player is more or less forced to put the character in a way apart, just lacking in many classic RPG systems: at least as important as the skills of a character are the fears, desires, goals, needs and history.
Specific claims, the system compared to DnD or DSA to the game leader. Due to the major significance and the legislative responsibility of the player it is almost impossible to follow a fixed preplanned plot. Frequently especially the improvisation the game leader is asked to tell the story.
The major hurdle of the control system is the relatively high level of abstraction compared to conventional RPGs. You have to engage in it as a player and game master if you want to get to know the game at its best.
If that succeeds, and those who manage to acquire the simple rule that can spend incredibly fun, versatile and varied games evenings.