It's been a little while but on occasion I have had a fly work so well on a trip that it got pretty ragged looking. It seems to have that "something" the fish like although it looks quite different than when I made the first cast with it. I have a tendency to want to replace it with a new fly same pattern but it seem experience has taught me leave well enough along and keep using the fly the fish have nearly destroyed. What are your thoughts along these lines?