furled leaders work very well on fast rods with a ton of spine, like the sage rockets or a lot of the stiffer lamis and also some of the cheaper rods with poor action, a 7' furled mono leader will flex and stretch 3.5 inches, protecting your tippet and allowing you to fish lighter tippets with stiffer more aggressive rods, if you have a medium or slow action rod all a furled leader will do is roll out your fly better but without the floatant the furled leader will sink faster, I use furled leaders when dredging the steel, I lose about half the fish I used to becouse I can have a fish get in heavy water or jump and keep much more tension on the fly than if you have to just let him run with say a climax leader or just straight fish line-