You've never got your fly stuck in a tree, just out of reach, have you?
Lucky for you =]
I myself often get stuck in trees, the trees bite far more flies than disappear to the bottom or in fish.
That's why I brought out the FlyRecovery, to be able to reach that branch so I could get the fly back, or even better the whole Czech Nymph Frigg.
You detach the part in the middle and hook the hook in the top loop, then you lift it up to the branch that is fighting and hook it in the groove on the opposite side of the hook.
You then unhook it from the rod and grab the attached line and simply pull the branch down so you can unhook the fly.
This has saved me very often and now I don't have to tie too much =]