I think the original poster was asking about the custom Onion knife, and the replies all addressed the Kershaw version.
I have one of Onion's knives with the speed-safe (or whatever he calls it) mechanism. Everything is done very very well, grind lines, action, etc. The only thing that isn't quite right is the liner lock. It pops with palm pressure. I sent it back, Ken was very anxious to make things right, but it still pretty much pops (it just takes more pressure now). Looking at the liner, it's obvious to me the "fix" wouldn't work. I did notice problems with other of his liner locks on the table as well.
You know my feeling already, the liner lock is a mixed bag at best, and most custom makers can't do them right consistently.
Joe
jat@cup.hp.com