I have the 5" and the 10". I've used the 10" once, and I will say that I found it challenging to cut the blocks after the squares were sewn together. The quilt was 12 squares by 13 squares before using the Twister ruler; the finished quilt after cutting and reassembly was approximately 80" X 90". I had to go to church and use two large banquet tables put together in order to cut the twisters.