My P-07 came with the safety installed, and even though I had other pistols with decockers, I decided that I would have to get used to using the safety lever since all 1911 guys love safetys.
Well, the flimsy little spring behind the plastic detent piece got bent and the safety never did click into the detent with what I would call any security. You just can't get plastic to click into place like steel.
A Safety is no good if it falls apart or falls to function with certainty. Besides that, no safety is to be relied upon--only proper gun handling.
I switched to decocker, it works much better than the safety and there is no spring to get bent and no plastic piece to get lost. I have had ZERO malfunctions with the decocker. Can't say that about the safety.