I don't get it. Is this whole thing the ruler - the white part? Are there slots in it to mark the lines? Maybe I need to see the real thing. Anyway, when I make a lot of HSTs I like to use the papers, like Thangles and others like it. Not crazy about drawing lines on the fabric and following them.
Will be interested to hear from someone who has used it. I like gadgets, too, but not sure this one is worth whatever it costs. If I saw it at a show, I might be drawn in.