Glocks have all kinds of mysterious problems that pop up in nearly every model which, often times, Glock refuses to fix through a recall. Usually it's called an "update" that comes in the later versions where you would need to pay for the fix. On a couple of occasions Glock has recalled pistols sold to police departments while refusing to fix those sold to civilians. All of these little problems have earned Glock it's reputation as a poorly made unreliable handgun and a manufacturer that doesn't stand by it's product.
I'm not a fan of Glock's trigger pull myself, but even if I loved it I would never own one for their reputation for shafting customers. While they might be a good deal for a handgun in their price range I'm glad I can afford better. HK all the way.