Well...they do work, they are accurate for so simple a design, and they're cheap and light enough to carry every day even in duty size models. It took me a day to get used to the rubber band feel of the trigger out at Front Sight's 4-day Defensive Handgun Course, several years ago. After that first day, I shot it well, winning the class championship steel match on the last day. Believe me, it was a surprise..
Guess my only complaint is the rifling that's not compatible with cast lead alloy bullets...oh, and the plastic sights.
We've had two, a G19, which we sold to a non-gun lover friend who needed a bedside gun; and currently a .40 G23. Both were and are 100% reliable with both factory and handloaded ammunition. But they just don't engender the pride of ownership that a good lookin' 'blued steel and walnut' 1911 has. With a Glock, it's more like the feelings I have for a shovel in the garage...
Best Regards, Rod