Each different die for the Go cuts different things. One cuts HST 3" fininshed. One cuts Squares. I have a parrallelagram and isosceles, I have a 4 7/8" triangle and 2" and 6" squares...some are made with just the right shapes for a particular quilt. Some are strip cutters. It can get expensive if you need a lot of different size triangles, or squares or whatever pattern piece you use a lot of.