The lock held fine on both of them. I was out in the field hiking in the mountians and stopped to make a fire and eat at another camping area. I broke one of them making firewood prying apart a piece of wood. It broke very quick too. I didn't have my fixed blade with me right then so I tried to use the Military.
The second one happened when I was at home doing some repair work and had to cut off some screws. Hit the spine with a hammer to drive it through and the blade just snapped after like 3 hits.
I am really very hard on knives though, harder than most I guess. I just expect them to take some punishment, most really can't or so it seems.