On my loner the sterum strap broke off where it attaches to the shoulder strap after about 4 miles, the other one broke off a couple weeks later. It also still worked it's way lose at the hipbelt. It's load lifters also worked lose.
On the other hand I will have a slightly used Z55 pack if anyone wants to take it off my hands. I'm still waiting to get my original pack back after 2 months. One of these days I'll call them and see what is going on with it.