It, along with the Endura being some of the most popular and widely used knives definitely sees a lot of hard use.
The folks I know certainly will use a Griptilian to cut sod, open bags of whatever needs opening, and cutting wood with occasional light prying.
To test the lock I've used my trainer to do chin-ups from a tree branch, using the spine of the knife, and did deliberately wrong angle stabs upward into telephone poles to stress the lock. The blade stuck into the poles, despite being blunt.
Since I only use it for training drills, I decided to spine whack the hell out it too...and it's still solid as when it arrived. :thumbup:
If you ever manage to break one, you've gone and done something monumentally stupid.