Is the force required to depress the lock release correlated with lock strength or resistance to spine "whack" failure? I was a little surprised the Manix' release was easier to push than a Bucklite I have. When purchasing a Spyderco lockback, would it be worthwhile to ask to handle a few and pick the one that had a lock release that was hardest to push as well as having the least blade wiggle in the open position? Overall the Manix felt very solid though. Just a little concerned after reading the Manix Spine Whack thread.