You can't seriously think a triad lock is the fastest and easiest to use of the locks you mentioned? A triad lock easier to manipulate than an axis? Really??
I have both.
The triad does not require me to put my thumb across the blade path while pushing the blade closed like a liner or frame lock.
I've been cut by a b
lock failure on both a liner lock and frame lock. I've had examples of both close with the slightest bump on the spine. Not spine wacks, because I don't do that. Just slight negative pressure will slip a lot of liner locks and frame locks.
The axis lock/ ultra locks are plenty strong, and do well with jarring or negative pressure.
They have a bit of an issue legally (LEO's can treat them like gravity knives because they are easy to flip open).
Closing the triad takes no more thought or effort than unclicking a seat belt, or open a pop tab, or flipping a light switch to me.
But I have to admit, my 9 year old does struggle, and he can close the axis lock pretty easy.
So I guess if I had a finger pinch force-o-meter I guess I could measure it and compare it with the finger-slide-o meter for the ultra lock/axis lock pinchie-slide action to close that knife.
I do just really like the triad. If I could get the lock in other brands, I sure would!
On a side note, the problem Demko points out with the liner lock is one I have had with several makes with liner locks, and seen in more than one frame lock.
Bumping or negative pressure on the spine is no good. I've been cut by more than one brand while making awkward cuts in tight spaces before. I've seen it happen to others, and seen a liner lock fail, with just a little negative pressure cutting rubber sidewall on a tire necessitate a trip to the emergency and follow up surgery.