I've had a G5RV up for less than 18 months. In the winds last night the wires basically pulled apart at the one end where the wire and rope meet. I think that there was a loop there, but I don't recall. I had it mounted with good pulleys on both ends that were moving freely so there shouldn't have been too much strain on it. Basically the wire unraveled.
Now I need to decide if I want to replace it with a G5RV (and hope that it lasts longer), or go with something else. The space between the trees was just about perfect for the G5RV so I want to stat within the same general ballpark in terms of length. Since putting the wire back up the tree is a pain, This is not something I want to do every year or so.
