Mine now has 5 years of use, with ski box all winter.That... makes me feel a little insecure.
I feel like, if something happens to yank on one of the corners (the compression bracket) hard enough, it's gonna go flying.
Zero movement, still tight (I used locktite on assembly)
But, like I said,my box is narrow, and not very tall, so it is very aerodynamic.
I won't put something like a canoe/kayak on it and drive at highway speeds, as that would put lots of stress on it.