I have one and LOVE it!!! Yes it is another ruler but Cozy Quilts (who created the ruler) has several books and many patterns using this, plus once you get into it you can use it to make most (if you want several of the same color combo) your half square triangles. As much use as I have gotten out of this I no longer consider it a specialty ruler. If you use a lot of triangle patterns you could pay for this.