In a way its just a re-expression of what nearly all rpg games are doing, but I find that thinking in percentages is just really logical and direct. Why do math or look stuff up on tables when you can just say, directly, what the odds are, and how stats and modifiers change those odds? It works well for freeform / fkr style of play, where you need to improvise the odds, or make things up on the fly. The goal with this was really just to make something simple enough that you can just learn and remember it with little effort, and never have to look anything up.
Thanks for the comment :)