we use a few echo serrated knives that are 20 or more years old. they sharpen really easy with only a few passes on the edgemaker pro. we also have a few chicago cutlery 842r knives that come from the local poultry proccessors. thats about all they use. my biggest echo is the best carving knife i've even seen.they stopped making them a year or so after we bought a set. i still look for them at yard sales.
