I've never had a problem with string leeches. In fact I've had the same set on my bow for three years now. I have to change them nw because I'm changing the string and ain't gonna cheap out by reusing anything, three years out of one string is plenty for me. And I don't shoot in a league but I do shoot pretty much every day it's not raining out without fail. So the set on my bow now has thousands of arrows through it.