I carry a SS Pelican PE almost every day. The other day at work, I used it to cut up some corrugated boxes after ALL of our utility knives seemed to disappear. The edge held up like a champ. But, after the 15th box, it was beginning to get really dull. Then again most knives will be dull after cutting 15 corrugated boxes into strips.
When I got home I ran it across the Sharpmaker about 10 or 15 strokes per side and it was back to almost shaving sharp.
Not bad for a $20 knife.