I've got like 7 or 8 of those "Asian Contract" 15 round Beretta 92FS mags...
They all feed and function fine, except most of them for some reason won't hold back the slide on the last round. I can manually pull the slide back and it'll lock, but for some reason it won't do it %80 of the time otherwise.
But, like I said...I've had 0 malfunctions with those mags feeding and ejection/extraction wise. None, in over a thousand rounds.