Storm reliability
Mine has never jammed, locked up, or failed to eject a spent round. It's a simple blow-back design, so there's no gas tube or other overly complex system to drive the cycling.
I would not suggest loading it with light, wimpy competition hand-loads, though. There's quite a bit of mass to the bolt assembly, so you'll want to use good quality, commercially produced, full-charge range ammo, or better.
When I take it to the range, I normally feed it Federal's "American Eagle" ball ammo (pretty standard shoot-em-up range-quality stuff). I've also put about 200 -300 rounds of my chosen defense round (that gets a bit pricey though), without a problem. I don't see why the 40-cal version would be any less reliable, but since I own the 9mm version, that's the model I'll speak to.
Since it uses standard and high-cap Beretta 92 pistol magazines (for the 9mm version), you'll want to be sure, as with any magazine-fed firearm, that you use good quality mags.
And oh, the Storm is south-paw friendly, too, for any lefties.