Flicking is fun, and a quick way to deploy a folder in a hurry, but I agree with Corduroy: it trashes the knife's lock work. I've talked to quite a few custom makers and they all recommend avoiding this technique. I guess if we're talking about run-of-the-mill production folders, who cares! Flick away. I doubt that too many of you want to prematurely wear out your good knives though. Most liner-locks are comparatively fragile. They have a limited life span. Flicking cuts this down tenfold.