Safariland III - is the only way to go! Watch the Ofc. Geeter Video from Carthage Tx, will make a believer out of you. It converted me. Won't ever use anything less.
Glock918 is right on target about practice.
Case in point: drunk bad guy runs in vehicle, crashes, gets out of vehicle and starts to hop fence. I tell him to stop and get on the ground. He turns and begins advancing on me with this look on his face of "C'mon, I'll take you." I unsnap my Colt and go to pull it out. It won't budge. I try agian, no go. Then I remember that I had the new Safariland III on. I hit the other one and out comes Col. Colt. BG changes his mind when he gets to greet the HUGE business end of the .45, falls so fast to the ground, he lives a cloud of dust.
PRACTICE, PRACTICE, PRACTICE, PRACTICE, PRACTICE