I have put my one through hell and back and I doubt to many would go where mine has gone. I launched mine off a jump at about 80km fully loaded with panniers and lander on a rock , it hit under the right side box and just put a bit of a dent in the plate, thats about 340 kg bike rider and gear.
I hit a tree stump at about 60km in the rain on a single track . It hit the left side box and only just marked it but it saved my foot. I have had it wedged in ruts plenty of times and jammed between rocks with the only thing to go wrong is I have bent a couple of the bolts on the bottom.
All the mounts seem to hold up well.