We all have are reasons so it's interesting to me to see what knot ends up at a experience fly anglers line.I tried the 16/20 (aka Pitzen) for the first time this spring. The first time I tried it I landed a nice steelhead on 4X while swinging soft hackles for trout, so I know it's strong. I've been using the 16/20 occasionally since then and I've landed some nice trout using the knot, and have had no break offs. I don't think it'll replace the improved clinch that I've been using since I was a kid, but it's a nice option to use from time to time. Easy to tie correctly, and pretty strong, a good combo.