My dogs seem to really respond to their collars. I like that the vibration strength is good because I don't want to use the charge mode if possible. We bought these for the water resistance and the ability to train two dogs with the same remote. The only thing I am having difficulty with is switching from one dog to another. It's a two handed process to hold down a button and turn the knob at the same time. It's just not a quick way to go from one dog to the next. Other than that I'm happy so far!