Commercial kitchens have long used those work table mounted units. If you have to open twenty #10 cans you will really appreciate one of those models. Small hand-held units are for the occasional can of soup but your arms will scream before you are half way through a few score large cans. They certainly deserve a hard look if you are setting up a group shelter or mass feeding situation. People who invest in large supplies of rations that come in numerous large cans should consider getting a commercial restaurant-grade can opener.