I'd never use anything that emits an electric shock on my dog. I've heard countless horror stories where the device gets faulty and shocks too much or gives continues shock. Really any kind of shock collar would not be safe to have on the dog when he's not supervised - just in case it malfunctions - so where is the use of an electric fence then.
I also admit that I personally HATE the feeling of getting an electric shock (like when I get static shock etc.), so I am biased for sure. It just is one of the worst pains imaginable for me - yes, despite that it doesn't last that long - so I just could not justify doing that to my dog when I know for sure that can't stand the pain myself.