Everyone I hunt with uses the new "hunter safety system" the vest looking setup... I had been satisfied using the harness that came with my Summit Viper SS. Until this weekend that is.... After climbing down saturday evening I went to undo the "loop nut" (don't know the technical name). It was seized and I was about stuck to the tree... I was able to loosen the slide knot enough to fit over the safety rope knot. I'm either going to invest in a climbing carabiner, or the safety system as well....