I have one of their KISS knives.....Couldn't ge it to take a new edge; called AG Russell(excellent outfit)whre I bought the knife. They stated it has to be done with a ceramic
sharpener and could take sevral hours to restore the edge....I have been sharpeneing knives for over 30 years and this is the first I could not restore an edge. I set it on the shelf. why use a knife that you willl have to send back to have it sharpened? I am diappointed in the edge holding ability.