I was searching threads about the AFCK and came across this bit from CJ Caracci who designed the original Benchmade AFCK.
The thread did bring up some interesting points about why the (well-made) liner lock is a good thing, namely if the assembly is strong it's very difficult to accidentally close it. With no buttons, levers, or thingies sticking out it's difficult to disengage accidentally.
With that said, I'd still like to hear the story of how Planterz' knife failed (and which CRKT it was).
I currently carry a Benchmade axis lock (921 limited in grey and BT) and like the majority I have had no problems. I have had smaller production liner locks that did not hold up to heavy use but the majority did their job quite well.
I do have some hesitation buying liner locks sight unseen since knife nuts will always want to test the lock mechanism of a liner lock first ("white knuckle", maybe a spine whack if noone's looking) where an Axis or frame lock I know that several factors are working to keep the lock strong within wider tolerances. But a reputable knife with a liner lock=no problem for me.
(Note I have cut out various comments about other lock mechanisms to prevent tedious flames in reference to a 3 year old thread, link below if you want to read the rest)
10-01-2001
"...
I am a user not a collector, therefore if a liner lock is made properly it will always be my favorite for a combat folder.
...
I do not mean these locks fail under pressure they fail by your hand or fingers inadvertently hitting or depressing a release.
Blood is an excellent lubricant and grip is paramount in use of the knife.
Before I designed the AFCK I have never seen a liner lock that was completely cut away as a finger groove. That was essential as far as I was concerned.
Even Mr. Emerson politely but truly unnecessarily asked if I minded him copying the idea.
What other kind of locks does Mr. Emerson use?
I wonder why? He uses the liner lock, because for real operators there is nothing better, yet.
That is why real operators like his product.
..."
http://www.bladeforums.com/forums/archive/index.php/t-171286.html