My two bits again. I think it is really splitting hairs. If the difference is between the shine, or no shine, you are in the one out of a 1,000 type thing. Fish see movement, and if the rod is moving in their circle of vision you are in trouble. There are things like spraying water over the fish in flat water...water that comes off of your line, and also the sound you make just walking the bank, or moving rocks while wading that are more important. Ducking low, and casting off to the side when in clear, flat, spooky water can also make the difference rather than standing straight up, or casting the line over fish than a shiny reel. The Kewi's think the floating line color makes a big difference, and now you see floating lines that are drab colored, or camo colored. I don't buy it much. I stand above where I expect to catch a fish, and present my fly first so they don't see the line, or the leader, and if it is tougher than that, I go find some dumb fish!