I have one. I haven't used it for fabric, but I have made and cut quilting stencils. Silhouette does have a fabric cutting kit. It uses a stabilizer. You can also paint on fabric with the fabric paints. (I've used sketch pens)
If you are interested, I would find out what weight of stabilizer and the cutting instructions (you change blade settings) are for fabric. Then you can purchase your own stabilizer should you buy a Silhouette.
I also make my own cards, so the Silhouette does that.