I can open it with my thumb pad about as fast as an assisted, anyway, as long as my pad doesn't slide off. It will open as fast as I can move my thumb. The problem with the nail flick is that there is no momentum because of how stiff the action is. As soon as my nail leaves the blade hole, the blade stops moving. For counter example, with the same motion and force I put into thumbnail flicking my centofante, my liner lock knife snaps and locks solid. This is why I've never liked assisted openers. I'd rather have the manual control knives like the centofante *ahem* have. I also didn't figure out how to close the kershaws I handled one handed.