Pro: you can cut a folded piece of fabric right from the bolt, con: it has 1/4" markings, but the slits for your rotary cutter are every 2 1/2". Don't use it as much as I thought, I found it hard to position and had to put a zillion little grippy things on the bottom to keep it from slipping. Got it from JoAnn's, 1/2 off plus free shipping.