Hi there. I have two dogs, 4 yr old Pembroke Welsh Corgi "Effie" and 9 month old Dutch Shepherd "Carmine". I have a mini educator and have had a cheap-o amazon collar. I can definitely tell the difference between them. I haven't had to use any e-collar on Effie except a bark collar for a short time, you can guess why ;). Carmine has had pretty good recall up until we moved to another state, where we started taking him to the dog park. It has become much more rewarding for him to ignore recall and run off to play with other dogs. This will not do. I do not want to poison his recall and teach him he doesn't have to come when called, so he gets the stim. Well not yet, I have to learn this course first.

I have a dog background and wish to further into dog training, so I hope to benefit professionally from this course. I already have a basic understanding of this modules information. 
Thanks!