This is why I love die cuts. 99% of my cutting is with a Go. Every piece is exactly the same. I can tell immediately if my seam allowance is off. If there is a measurement I don't have for a quilt pattern I have a custom die made. I haven't found that many quilt patterns there isn't a die for, maybe a different size block so I make more or less of them. I seldom use my rotary cutter unless I'm using a specialty ruler.