I like specialty rulers. I have a drawer full of instructions on how to use them. When I need one I rummage through the papers and this keeps my memory fresh on what rulers I do have that does what. The rulers that come with quilt books I have them attached to the book. I have one ruler that only has 7/8 measurements marked and I have used it much more then I thought I would. I keep the smaller rulers in a basket, the large ones hanging on the wall and the med size one in a ruler rack.