There is one card in my gallery that uses spirelli; you can see it
here
I currently have one set (two punches in staggered sizes) of spirelli punches. I will be buying some spirellabilities after I get all the nesties I want. I only have the one set of punches and I got them on sale but they still cost more than two or three sets of spirellabilities. I am really looking forward to having a few more shapes.
This is a fun craft and I think they make a nice addition to a card. I am also envisioning it being a portable craft for sitting in doctors' waiting rooms etc, since I can pre-cut the shapes then wind them anywhere.
HTH
ETA: I got mine at HSN. They don't have the ones I got anymore, but they do have a really nice starter kit- 2 punches, some paper, and a lot of metallic threads, plus an instruction book- for $30. This is, to me, a very good price for what you get.