There are also gear analogies, and this is the one I like best... consider the fly line you use with the same care as you would choose the golf ball you play. Different clubs suit different swings. Same is true for fly rods. And just like some golfers prefer golf ball attributes like low trajectory, higher spin, distance, and feel, the same thinking applies to fly lines. I've already said that a $75 investment in a great line can help you cast better than spending a few hundred extra on a new rod.