Jason, I've never had any line damage from these things. They're made from a very soft plastic so crimping the line is not a problem. I've never had one move down the line. And when you have only one knot tied to the hook instead of two more from a barrel swivel, there's no knot failure. I use 1/2 oz weights 90% of the time. If I go to a 3/4 or 1 oz weight, I just add another Keeper below the first one. These things are great. And if you need to adjust the leader, it takes 5 seconds to do so.