Thanks but I never stayed i.had problems loading the magazineI have the Shield Plus Performance Center 4" Ported model and it has been failure free through its first 250 rounds. The only issue I had at first, that other owners have also remarked on, is that if the slide is forward (in battery) it is very difficult to get a fully loaded 13 round magazine to lock into the pistol. I kept my magazine fully loaded for a week or so and the spring has "broken in" enough that it will lock into the slide-forward pistol with a firm push instead of a hard smack.
I am of the opinion that S&W made the 13 round mags as short as possible and the very strong spring pressure pushing the cartridges up against the bottom of the slide is what makes it almost impossible to lock the mag in place.
Try pressing down on the cartridges in a fully loaded mag and you'll see what I mean.