I have several Serpa holsters. I carried my 92FS in one for several years while doing weekend security at a local night club. Broke up many skirmishes and drug many a person out without a problem. Several times I even had to draw my Beretta from it and I never shot myself, bystander or person I was aiming at.
You just need to practice with whatever holster you use. It may look ridicules to someone looking in, but practicing drawing in front of a mirror (with an UNLOADED gun ) makes all the difference.