I have about all the Go dies now. I watch for a deep discount or clearance sale and buy a few at at time. I buy new mats when I buy the dies. I found that the worn mats on some dies can be used like new on other dies. The areas used are different on each die. My favorite die right now is the 8 1/2" rag die. I can make a large rag quilt start to finish in less then 4 hours. Those that say the fabric waste is too much haven't used one or used it incorrectly or be like my DGD and cut right out of the center of a piece of fabric. LOL