I have one on my trailer too, however I installed it a bit lower on the screen door. I have children so they use to open and close the door without having to push out on the screen and damage it. Also is useful in closing the screen door. I love it.
If I did not have kids, not sure if I would have it or not, but with kids, it saves the screen material.
Just bought one about a week ago, but havent installed it yet.