I only use it when I'm dealing with a fly line that has a crappy coating that wants to pull off with a nail knot. I prefer a needle nail knot with 40LB maxima which I blood knot new leaders on to. Smooth and simple and I don't have to tie any nail knots on stream. I reverse blind splice loops on the back end of my fly line and my backing because it's a smooth connection and I can change lines without tying any knots.