I have two reels set up, one with the loop and one without. I use the one with the loop a lot and haven't had any problems with the loot loosening. The braided sleeve acts like and old chinese finger trap, the harder you pull, the tighter it gets. Add the heat shrink and it must be nearly unbreakable. I know it is the devil to get one of those things on the fly line and I had to make two tries to get the one on. Will probably use the nail knot next time since it is the tippet that gets changed out and not the leader.