I can punch more than 30 sheets of paper or at least 15 sheets of transparency film. I am satisfied with the good quality for now. Hopefully it will last for a long time.
This punches holes in multiple sheets with surprisingly little effort and it folds flat for easy storage. Although the spacing of the holes is fixed there is an adjustable sheet guide that lets the user control how far from the bottom of the sheets the holes start. The punched out dots are collected in the bottom. My only complaint is that the opening to empty it is so small that it requires tilting back and forth and shaking to get the dots out. My first attempt ended with half of them on the floor a minor problem that requires more care when emptying.