This is probably a subjective question but here goes. I have a small regular Sebbie that is my "beater". I take care of it and use a sharpmaker to keep up with the edge. I was using it to cut cardboard and noticed that its edgeholding ability was perhaps a bit less than I thought it should be. ( I know cardboard is tough on knives.) Initially I could cut without "sawing" but after a few boxes, I had to saw some to cut. I only cut them up to separate them into their respective panels, not into a bunch of pieces. They were large boxes. Am I expecting too much? 
