You seem to remember a review. I seem to remember using mine. I'll go with my experience.
One review I saw said the pivot wasn't as strong as it could have been. It's stronger than I am, though. Another review described what may have been a defective lock. That can happen.
The basic mechanism is extremely strong and effective.
I think this is a review which puts doubts on the reliability of Extrema Ratio locks
http://www.bladeforums.com/forums/showthread.php?p=3559409
and more
http://www.bladeforums.com/forums/showthread.php?t=647982
Franco