I have been carrying a inexpensive($40.00) Colt cobra liner locker.This has to be the fastest opening liner locker i have ever handled.Without any flicking of the wrist, the thumb stud opens this knife as quick as a spring assist knife and as quick as a "get into trouble" law restricting auto. Lockup is rock solid and the knife,440stainless, is quite sharp. United cultery seems to have made a real decent knife here. anyone have one of these real fast opening folders?