I have Graphtec FC8600-130. Do not contour cut much but I do not have any problems with registering. I thought I did when I changed printers but then I realized the issues are because of the heat from Latex printer.
I do not have complaints, if I had more money, i would have gone with Summa, but, I'm also happy with my Graphtec.
Both are good, I probably would not look at any other ones. Summa is better, but also cost quite bit more