My regular EDC Vantage won't flip out when dropped, though I've only ever dropped that on carpeted surfaces. However, I have dropped my Vantage Force on concrete (poor knife has three little gouges in its handle now) and the blade opened halfway out. That was probably due to a combination of how it fell and the fact that the detent on my Vantage Force is a little weaker than the detent on my regular Vantage, though I'm sure that varies a bit between knives considering these are production knives.