Personally, I don't like to use the collar as a punative tool or a compulsion tool.
As a bark collar, it is stictly compulsion, punative tool. You do this........you get zapped. So, you curb this behavior, but it also decreases the dog's drive while on the collar.
For me, I want crazy drive when doing OB. The e collar for me, is an OB tool to SPEED the dog up. That is it. I don't TEACH a new command with it and I don't punish or give corrections with it.
As a training tool, ALL YOU ARE DOING IS TEACHING THE DOG, HOW TO TURN OFF THE STIMULUS. This is key.
for example. COME or recall. The dog has to know the command first, with food or ball. Then I use the E collar.
I use a very low setting, enough to get the dog's attention and the intensity of distractions. Something like someone constantly tapping on your neck. Bothersome but not painful.
BEFORE I GIVE THE COMMAND, I SEND A STIMULUS. Then give command. When the dog TURNS AROUND TO COME, I remove the stimuls. In this way, the DOG controls how to turn the stimuls off. He learns how to turn off the collar. Upon full completion of command, come, heel, and look up, he gets a tug (reward).
This tool makes your dog SUPER FAST. Each time the dog will do it faster to turn off the stimuls.
It is a wonderful tool but a tool that many do NOT know how to use properly and is too easily abused.
It is probably the fastest way to ruin your dog if you don't know what you are doing.