For my uses, when a chopper is put to work, it will eventually come into contact with things it's not supposed to, whether by accident or because it can't be avoided to get the work done. This means the edge may hit the ground, or a piece of scrap iron that was hidden in the weeds, or ya have to chop out some roots, or do some digging, or there's dirt & mud stuck to the bark of a downed limb, or ya whack a piece of concrete, etc. The knife doesn't really matter. I've never heard of any chopper that will maintain a pristine hair-popping edge after whacking a rock. It will need sharpening. Even if the worst nicks are only 0.3mm deep (which I don't consider horrible), you can only do that 10 times before you've lost 3mm of steel off the edge.