Any fear based method is a huge no no for me and that's exactly what this is any way you look at it. For a dog that is strong willed or isn't bothered by much, you'd have no luck. Like I've said in the past, an actual correction and praise-just training a dog w/ a leash and collar isn't for everyone. Call me old fashioned w/ a new twist if you will.
But I'm glad you enjoy the results your getting.