I gotta disagree on every count here. If it's actually for defending your life, it should work every time no matter what and be thoroughly trained with on a regular basis.
In a professional capacity, I can't disagree. How many bad people or large, dangerous animals have you proposed to shoot in self-defense?
The same way I've known people with bunches of Snap-On tools who don't know a water-pump from a wheel-cylinder.
Cheap or expensive, the gun and ammunition only needs to work on ONE occasion in the capacity of self-defense.
Alpha brands are not a guarantee of a positive outcome.
However, I would agree that if a person is killed because their cheapo gun failed to function, there would be room to heap criticism on that person's decision.
If an expensive, Alpha-brand weapon malfunctioned under the same circumstances all a critic could do is shrug his shoulders and say "he didn't die cuz of a cheapo gun".