Seeing as how Glock and the 1911 platform utterly dominate the competition circuits, I'd say they work pretty well if you know what you're doing. Pretty much all of my wins came with either a Glock or 1911, except for the two seasons I ran S&W revolvers. Malfs were exceedingly rare, though I'd have to give the nod to my Glocks in that category overall.
That's where I see a lot of malfunctions. I shoot USPSA, steel challenge, and 3 gun.
I use M&P's
The only issue I've had is, if running mag extensions, the springs need replacement every 500 or so rounds. If you keep on top of that and squirt some lube in on occasion, they'll run all day.
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