My only issue with the thread is the title and the information given. I think its more than fair for some people to dispute that a 6 month old puppy needs an ecollar in order to get it out of the "landshark phase." I've been randomly rebuffed plenty of times when a fact that I stated wasn't "complete" and the reason given by the other posted was "just in case someone searched the forum, found your statement, and wanted to take it as 100% fact." (Most times completely out of the context of either the thread or the post).
So now, after this post, people will come on for advice on how to get over their puppy bitting, and will think that their monster is just as bad, or worse, than OP's monster. So then the only answer is clearly the ecollar. And that is just false, for the rest of us, we somehow managed to teach our dogs not to bite us without it. I know for sure all the dogs at my club get taught to not bite without it, and many of those people have had many many more GSDs than OP.
Maybe, this dog is worse than the hundreds that have come through my club, and the thousands that have been in the hands of all the members of this forum. But its pretty difficult to believe that, especially with how the OP describes the other things the dog does (sounds like a very good, sound, dog). I think the majority of us would not have had an issue if OP stated, I had my dog evaluated by a trainer and the trainer said this was the only way to teach your dog to do this. But from an arms-length point of view, to many of us, we have a hard time believing this couldn't have been taught with treats, redirection, or other methods that don't involve any kind of punishment or physical correction.
Anyways...back to the point of this thread giving out misleading information. I remember a thread not too long ago where someone posted about the magic of the ecollar and a new member responded by saying how they can't wait to get one because they can't potty train their 4 month old. They clearly thought that this magical tool would teach their dog to potty outside. So...how many of you would agree that a way to housebreak a dog is an ecollar (or any form or correction)? This is where this thread goes down a slippery slope...