i do compare the accuracy from one brand to the next but may be off a scant 1/16" in most cases. I was going to pick up the 6x24" ruler but i have a metal yardstick and square ends with my yardstick and 6x12 or 12x12". Right now I have plenty. Not enough of an expert to do the fancy dance ones. If all else fails I can paper piece or move onto something else.