I've never heard of this collar, so I googled it. I watched this video with the sound off:
The dog in this video is extremely stressed: tail tucked in, lip-licking, disconnected. He is in avoidance, and is trying to mentally disconnect from the handler.
Based on this video, I would not use this collar. For control, most dogs take to a prong very well, and do not show the stress and avoidance that this dog does. The irony of all these "gentle" control methods is that dogs hate them, and are so stressed by their action that they don't learn anything. Correction: they learn to hate walks.
I second what Castlemaid said.That poor dog looks like it's being led to certain doom.I also watch any dog training videos with the sound off so I can focus on what's actually happening instead of the sales patter
You can use the same technique with a regular collar if you have the discipline to stop each time the dog starts to pull. And keep the collar high on the neck. I agree that this video show a confused dog, not a confident one walking nicely on a loose leash. I would hate to see what would happen if this dog became startled and bolted.
In my opinion that dog is walking slowly because he is afraid not to. I don't like stuff that submits rather than teaches. I second the prong. It is more "feedback" than punishment and forced submission. When used properly.