Everyone and their brother has used a 92 with a serpa while in the service, myself included. That doesn't mean its the best choice, or even a good one.
-Nationally recognized (essentially peer reviewed, recognized, and sometimes recommended) instructors have spoken against the Serpa holster's design or banned it from classes.
-Verifiable instances of people shooting themself while drawing from the holster.
-Verifiable instances of the mechanism being jammed by debris, to the point the handgun could not be removed with a normal draw.
-No high level shooters that im aware of choose the Serpa for a holster when shooting OWB retention.
Some might call that a clue. The issues could be a matter of training correctly, but its training opposite of the bodies natural grasp reflex which is harder than some other options for holsters. The amount of training needed to get your pistol out and on target safely is far higher, and still leaves room for error greater than other options. That training could be better spent with a different holster on other aspects of shooting.
My suggestion for an OWB retention holster. I have not used a safariland retention holster, so my suggestion may not carry much weight. However, if i was in the market for a OWB retention holster they would be my choice. Alot of firearms selection, good retention, high level trainers use them, several FAST coin holders have used them proving they can be used to a high level of proficency, and to my knowledge they dont have qc/qa issues. I dont have one to say they are the best ever, but if i was shopping thats what i would buy.
-Cory