Kevlar line does have one excellent use - occasionally when flying a kite, some idiot will decide it's fun to buzz my kite with theirs with the aim of tangling the lines. As I usually use some fairly good (and not cheap!) braided lines, I don't like them to get damaged. So off comes the braided line, on goes the kevlar.
Then when the idiot decides to tangle lines, my line stays intact whereas theirs gets instantly cut in two and away goes their kite...
