Hey Watson,
I don't have a Go, I have a Sizzix Big Shot Pro, but I use Go dies in it. If you have things that you cut a lot of, you will love it.
I use mine to manage my scraps since I have very little in the way of storage space. As a result, I have dies that will cut 2", 2.5", 3" and 5" squares.
I also have dies for 1/2 square triangle and found that my accuracy went way up when I started using those dies. It was a life-saver when I was working on my temperature quilt last year that was all HSTs that finished at 2" square.
You can often get dies on sale either from the Accuquilt store on-line, Amazon or Quilt in a Day.
Rob