I used these panniers for over six months in the Alaska Panhandle, and I can attest, they are rock solid. On almost a daily basis, maybe five hundred or so miles. I rode in rain, sometimes snow, and the Taku winds, and these panniers held up remarkably. Never did anything get wet, or damaged.
They still look exactly the same as they did new. I highly recommend. Note: they work best with the Thule Rack, which is also awesome.
SF Bay Area, California US