i have a Fiskar medium sized rotary one good enough barely for 11 inch cuts. fresh sharp blades are always a necessity, especially if you cut resin coated paper. one designed for artwork holds the paper better, but without fresh blades, you still won't get a good cut. much larger than that and i use my matt cutter and holder. that is good enough for 30 inch cuts. it has straight blades.
Herb...
