You guys amuse me the way you justify using shock collars, ie "I felt it and couldn't believe how light the shock, (not that you use that term) was", "I only use it for specific problem training issues" and on and on you go.
What I have noticed when I have seen people testing a shock collar, is the immediate reaction to pull your hand, arm or whatever area it is being tested on away!
A shock device attached to a collar which is firmly fixed to the dogs neck, means the poor dog doesn't have the opportunity to pull away and has to bear the full intensity of the shock.
The guys who use it perpetually for perfect sits, stays and downs, would probably be better off with one of the new robotic dogs, which would deliver a perfect reaction instantly.
Where is the joy in owing a living animal if it has to be shocked into action instead of it offering you behaviours on cue. I don't have robot dogs, but I do have happy manageable companions.