So far, pretty good. I only own two, one a Kershaw Amphibian boot knife, made back in 1990, the other a currently Antelope (I think).
The Amphibian came with two options. Being a dive knife, it came with rubber leg sheath or the leather boot sheath. Never being a scubby diver, I went with boot.
The Antelope is pure hunting sheath knife. The bottom one.