I got my sub-2000 ( 9mm Beretta mag ) over a year ago, from what I remember on the first 100 rounds I got some stove pipe jam, may be 4 or 5, always on the last round of the mag.
Only on the first 100 rounds, I can't remember having any jam since, I shot over a 1000 round with it, using every brand and load I tried (115, 124 and 147 in Remington, Winchester, American Eagle, Geco, Sellier Bellot, Blazer both brass and aluminum even if they are not recommended)
It's a good idea to check the mag first, the space between the lips of the mag can affect how high the tip of the round waiting to be chambered will be and the angle also.
Last summer I used the mag that came with it (pro-mag) and Check-Mate 9mm (Beretta 92) mags bought separately.
This summer I also got Mac-Gar .40S&W (Beretta 96) mags, I only shot around 100 rounds using theses, but they seems to work fine, one was good strait out of the box, the other needed some adjustments, the lips were slightly to wide raising the tip of the round too high to feed properly, made it smaller by a few hundredths of an inch (measured with a caliper

) it works fine since.
Just in case someone wonders why use 40S&W mags in a 9mm gun..
http://www.rcmp-grc.gc.ca/cfp-pcaf/bulletins/bus-ent/20110323-72-eng.htm points 4 and 5