I had one misfortune with my Klick-Fix fitting. One morning I mounted the bar bag, but failed to click it home. After 1/2mile it bounced out of the mounting onto the front wheel, balanced there for a moment, then headed under the front wheel. I was so intruiged by the freak event that I failed to apply my brakes, but the bag acted as a giant brake block, skidding down the road under my wheel. Eventually I took a fall at low speed, with most damage to my pride.
The Caradice bag suffered some minor surface damage from the friction, but nothing too serious. I should get 5 more years use out of it at least.