After diligently searching, I could find nothing negative about these knives, just the sheaths. The UTKB-6 is about $10 cheaper here than anywhere else I could find it. Count me in, even tho I am not sure that the sheath is really Kydex. There is disagreement about what the sheath is made from on various website. If I find it necessary to shake that thing at somebody, it won't be the sheath.