I love the go and use it constantly! I never would have wanted to rotary cut a tumbler quilt and so I never would have attempted it. But the go cut perfect tumblers and it was so easy to piece.
But... I bought the dwr die thinking that the accurate cutting would make it possible for me to do it also!! Wrong!!!! I finally put it away and hope (like peckish) that someday my skills will have improved enough to finish it.