Robert, I don't have experience with any round knife, but I have been researching which one to buy. I haven't heard of a J Cook, and based on the lack of response, it doesn't seem like anyone else has either. The general idea I have learned is Osborne or Gomph and maybe Stolhman, and generally speaking the older the better provided the blade is in decent shape. There are obviously any number of great knives out there. What makes you interested in this particular brand?