I have tried several brands and the Spitfires seem the best for me. One thing I have noticed with all of them is they are not ready straight out of the pack. I take them apart and adjust the tabs and blades and also oil them so they open just right. Same with after use. I don't know how they would react on heavy bone but then again I don't aim for heavy bone. I did have one slice a rib in two clean as a whistle.