I think it depends on so many factors it is a hard question to answer. Depth, water speed etc. I have tried them and still have them but it complicates things. More stuff to carry, more tackle to learn. I have gone back to nylon for my wet fly fishing because I know how to work the tackle to get the results I am after. I think they would be good if you are dialed in but limited to adjusting on the fly without taking the leader off and trying another. With nylon you can tinker..just my 2cents