I've had my 930 for almost a year and mine has run great with everything from bird(the cheap stuff), to buck, to slugs. I had to adjust the front sight quite a bit for the slugs to print on paper at 50yds. Mine has been great, but I've only put about 300-400 rounds through it. However I have a buddy who had one that would only cycle high-brass shells, he tried every type of less expensive ammo (and detail clean/oil) and nothing worked. The trigger guard on his ended up breaking off during a stage which required shots while prone on top of large rock. Yes that could possibly be operator error for leaning to hard on the rock, but I shot the same stage the same way with no issues. He traded/replaced it with an FN which seems to be a great gamers shotgun. It seems from reading this thread (and personal experience) the spx is a mixed bag. If yours will work with cheap birdshot, it's a good gun. If not, I would try to maybe trade it before it gets too much wear and you take a beating on the trade in value.