for those of you who might be on the fence with this thing: i highly recommend it. for regular origami, its major use would be the annoying precreasing you sometimes have with the more complex models that are almost invariably way inside the model. like say, nguyen ngoc vu's great white. before your eyeballs would hurt while you try to remember the two, very often odd, reference points are, then creasing between them... then finding out you made a mistake then doing it again. with this tool, just take a ruler, line up the points, and voila.