I volunteer at my granddaughter's elementary school and I purchased several pair which were easier to use than the ones they had which were larger and hard for me to handle. These fit my hand better and were easier to squeeze and the children could help to when punching cards. I am very pleased with my purchased. The cushioned grips is a plus also.
We have several 3 hole punch mechanisms but needed a single hole punch for a school project for my son. I bought the medium priced hole punch because we had about 20 laminated papers to punch. My son hole punched 3 papers and it fell apart. Very poor quality.