These little rings make changing tippets a breeze. Plus, if there's going to be a break-off, chances are it's going to happen at the ring, which means you won't loose a long length of your leader.
In full disclosure, I don't use these rings.......however, I've been on the fence about using them for a while now. I generally use a surgeon's knot to make my tippet to leader connection, but I've been thinking of giving these a try. The one thing that concerns me most about them is twisting, especially if you're fishing a longer streamer fly that has a tendency to roll, etc. Other than that, the theory of the rings (at least) sounds good to me. Who knows, maybe I'll end up loving them?
Below is a short video showing you all about these tippet rings, how to use them, etc. If you haven't tried them, give them a go......& then let me know how they did!!!