Agreed. Their clips are kinda flimsy and if you don't know how to correctly put the cards in the clip, then it can tear the box and cellophane (if you keep it on the box).
My recommendation would be to bite the bullet and go with a Joe Porper clip. Best clip I've ever owned.
There is no good, cheap card clip. The cheap ones are purely aesthetic. The only card clip worth your money is a Porper clip. It is the only one that keeps the cards flat. Just save up and buy the real deal.