To be honest and totally open, I have witnessed an Opinel number 7 fail completely, and I cracked one of the two 'fingers' of wood that the pivot pin and everything is mounted on.
Many years ago, on a winter morning hike, my friend Danny's wife slipped on some ice while crossing a rocky slanted part of the trail. It was a late winter snow hike, and we planed to eat some doughnuts and drink some coffee while admiring an ice waterfall.
We had my old SAK pioneer and Danny had an Opinel number 7. We decided to make a stretcher out of two saplings and the space brackets we had that we were going to sit on for ur 'picnic.' We both knew how to make a V groove to create a stress line to snap off the saplings at the cut groove. Halfway through the job, Danny's Opinel destroyed itself. The whole top part that was mounted on the wood handle sheered off even with the lathe cut step that the locking ring sits against. That step in the wood acted like a stress line and the whole works, blade, bolster, and locking ring sheered right off. Granted, Danny is 6' 4" and about 240 or 250 pounds. He was a bit anxious as it was his wife moaning with what turned out to be a badly fractured ankle. The Vic pioneer finished the job. The irony of it was, Danny had a Vic farmer at home, just forgot to bring it.
Not too many years ago, I was doing some yard work, and tried to use my number 8 to prune a branch off a tree that was sticking out in the walkway. It cut about 3/4 through the wood, about a bit thicker than a thumb, and stuck, and I twisted it a bit to free itup. One of the two 'fingers' of wood that everything is mounted on cracked and the whole affair got very wobbly. Tossed it in the trash can.
I no longer use or trust an Opinel for any "heavy duty" cutting. Now I just carry a fixed blade if hiking or doing yard work. My Opinel lives in the kitchen drawer where it gets used for precise slicing of veggies and fish. They do cut like the dickens. If I want a rugged pocket knife, thats what alox SAK's are for.