The RMD is bigger and much heavier than my Al Mar SERE Operator. It is a very rugged hard use type knife, suitable for the most demanding military or survival situations. It would take a tremendous amount of abuse to break one. Over the past year it has become my favorite mid-sized knife. Like the SY S6, it is one of those knives that just feels right to me. And the 52-100 steel takes and holds a very sharp edge.