I spent a number of hours several years ago building a folding tool like those commercial ones. I do a lot of pe work, and find myself using it less and less. I also find, like others above, that working with good pliers and screwdrivers I can do the bending I need without setting up that tool. Takes a little practice to acquire the skill, but once acquired it goes faster with pliers and screwdrivers than with those bending jigs.