I love my Go too. The dies are not cheap but they do have sales and I order them from Accuquilt when they have free shipping or when I intend to make the quilt and need the die. It is the same price no matter where you buy it and when I order it from Accuquilt they don't charge me the CA state tax.
My friend and I cut out a DWR quilt for a King size bed in about an hour. She was making it with the arches as one piece so that made it a bit faster but all those curves it would be a royal pain to use templates. And those little notches are very helpful.