It's lightweight and easy to store. Just a really cracking product. Easy to use, fantastic value and compact.

It has a slight indent on either side so you can tell perfectly where the blade will cut. The springy part also allows you to cut slits in the middle of the page if needed. I used this to create corner slits for inserting a card into another.

It is already blunt. It overshoots the 90° angle and isn't even lined up at the hinge. The blade wears off after literally 10 cuts leaving ridged edge.

Concertinas can only cut 1 piece of paper at a time. If you have ordered then i recommend you return or cancel order asap. It's unclear where you are cutting. Should have just used scissors.