I asked similar question few pages back. None of the people who replied experienced bad things happening to the lock. My Shiros are good so far. Two of them are frequently used one is F3 produced around 2014, the second one is F95NL produced in 2018. I'm a bit concerned about F95NL, because when I cut something hard or when I grab the knife tight, the lockup goes to 100%. So far there is no blade play or anything wrong with the lock. I decided to carry this knife almost every day, especially when I know that it will be used, to check if the lock is going to wear. We shall see how it ends