"Strike indicators are helpful if too much depth isn't required. Anything over about three feet is awkward and unwieldy and casts often terminate with the indicator on target and the fly lying on top of the adjacent weeds. Also, strikes commonly occur before the slow sinking nymph has straightened out the leader and the fish may eject the fly with no movement of the indicator. These devices have a place in our arsenal but they are not a panacea. The angler will find that they are useful in some situations but a hindrance in others."

The Sunfishes, pg. 83
By Jack Ellis