spyderco in the endura models is a best buy. i own several & swear by the zdp189 alloy. recent models in s30, 90v, & 110v have had spotty quality control, my 110v was'nt heattreated but the factory did do the knife over , however it was'nt a super performor .i think spydie does best working with their earlier tried & proven alloys. cranky72
