None at all. With the first rep, I could never make him understand that I needed the stimulation across my entire chest area and he would only program for one side or the other, neither of which came anywhere close to the affected area. The second rep at least understood that I need both sides. So now I have sensation under both armpits instead of one, but nothing in the center of my chest where the pain actually is. I'm getting really worried that it was misplaced, but they keep saying, no, we put it where it's supposed to be according to the x-ray.