I have the shape cut mat and use it every single time I cut my fabric. The only thing I don't use it for are my borders. I use my long t-square then. I only have the 12x12 though. Mine is starting to get into rough shape so I'm going to need to break down and buy a new one here soon. I cut my strips one way, pick it up re-align it and zip the other way. when I pick it up I have a board of squares. Sooo cool!!