It works great, but you need to watch out the thickness of materials.
If it's very thin material, it can cut some tight curves, but as material thicker, the curves need to be bigger, otherwise the material will be pulled and tangled or break the blade (if the material is thick and hard). 
I use on suede leathers. I tried to cut ½ inch height font out of 1.5 mm thick suede, but it didn’t work well. It must have bigger front to avoid tight curves.