I have tried so many cutters with bad results that I have lost count, some of my let downs have been;

the fiskars circle cutter
the blade runner
the Coluzzle

But I have found two FABULOUS cutting tools.

1. EK Sucuess Orbis Circle Scissor AND
Don't laugh BUT
2. The Crayola Cutter - this cutter is battery powered and works great with stencils. Freehand takes practice but it's a great tool.

Happy Scrapping!!