All I have to say is collar smart.... In just a few sessions Diesel became collar smart the dog he is when it is on, is not the dog he is when it is off. I only use the actual nick function for a recall, everything else is the pager function. It is enough to remind him that if he chooses to not respond there is a consequence. HOWEVER, I was very cautious in my use of this and still am. I use it on the lowest setting possible to get his attention, and we tried many other training methods BEFORE the E collar. (Treat, praise, toy positive, mixed positive for the correct action with negative (pinch collar) for the wrong) His response was not / is not consistent without the E collar.
Each dog trains and is motivated a different way, so it is not for all dogs.