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I jammed one on the range using an underpowered reload.My stupidity for using reloads in a Glock.I frequently fire a Colt Series 80/Mk4 Officer's Model and a Browning Hi-Power 9mm.I have never had either jam other than an occasional stovepipe,easily cleared.Police departments are loathe to authorize single action autos,in the modern vein of acomodating the lowest common denominator rather than demanding excellence.I don't see the great advantage to the Glock "safe action trigger"-it is no improvement over single action.The whole DAO thing started over police agencies irresponsible jerks in the last ten years or so.I learned to fire a .45 auto in the service at age 18 and it is still my favorite.

The Colt .45 rules. I started carrying 9mm's because .45 ammo was hard to get in some countries outside the U.S.

Those underpowered reloads can be a b!tch. I had to fix a Browning BDM that a guy blew up shooting reloads that he made without knowing what he was doing. If he hadn't been wearing glasses he would have lost both eyes. The barrel was bulged so bad I had to cut the takedown lever apart with a dremel tool to get the gun apart.

I don't see the great advantage to the Glock "safe action trigger"-it is no improvement over single action.

The Glock's action is AFAIK completely unique. Indeed, I would like to see the terms "Single Action (SA)" and "Double Action (DA)" replaced with four terms, defined as follows:

Single Action: Nearly all of the energy for the hammer is imparted during cocking; pulling the trigger does not add any appreciable energy to the hammer.
Double Action: All of the energy for the hammer is imparted by pulling the trigger. On any gun I'd call double-action (see below), repeated trigger pulls produce repeated hammer strikes.
Intermediate Action: Some of the energy for the hammer is imparted by cocking, but some is added by the trigger. IAO pistols tend to have shorter trigger pulls than DAO's, but they cannot repeat-strike a primer in case of a misfire.
Glock Action: Much of the energy for the first shot comes from the first trigger pull. Unlike most DAO or IAO pistols which decock or half-decock themselves after each shot, however, the Glock remains fully cocked as the action is cycled. Fully releasing the trigger will cause the Glock to be half-decocked. Releasing it only slightly, however, will reset the sear mechanism while leaving the hammer cocked, allowing for what is almost a single-action trigger pull for the follow-on shots.

Comparing Glock Action to DAO, SA/DA, and SAO pistols...

The only possible disadvantage of the Glock over a DAO is that it has a lighter trigger pull. While this is a good thing if one has the discipline to keep one's finger off the trigger, it can be a bad thing if one walks around like Mulder and Sculley with one's finger on the trigger.
The Glock Action's first-shot trigger pull is not as light or short as many SAO pistols'. While some people seem to like external safeties, they create the hazards that the user might fail to set one to "fire" in a self-defense situation or might forget to set one to "safe" before holstering one's weapon. With the Glock, the trigger-safety design means there's one less thing for the shooter to worry about.
While SA/DA pistols may have been the best thing around when they appeared, they allow often the user even more opportunities to do the wrong thing than SAO pistols. Unless someone always sets the safety on their weapon before holstering (in which case they may as well use an SAO) there's a risk that a shooter might try to holster a "true" Condition Zero firearm.

The Glock's 'trigger safety' has only three rules for observation; even a novice should be able to master them:

If you pull the trigger, it goes bang.
If you don't pull the trigger, it doesn't go bang.
If you don't want it to go bang, don't pull the trigger.

What's so "advanced" about that?