Wow! I LOVE this item! I have cut corners on chipboard, matboard and illustration board with NO problems. It works just like a hole punch, even catching the litter. It is sturdy and easy to use. I have arthritis in my hands and have NO PROBLEM using this item. It is really easy and painless. I highly recommend this corner rounder!
I purchased this punch after already purchasing many others. Are you are going to be making board books, especially those of heavy duty acrylic plastic? This corner rounder is the one you are going to want to hold up to the stress of cutting such heavy materials, without breaking down. Excellent value.
Finally - a rounder that's a stronger and more substantial to get a hold of than the old blue one we all started with. Tried it at CE and raced home to buy one! Although I own the big huge cut 60 pieces corner rounder- that's not practical to travel with. This is the answer-- worth every dime!