I just had the trial for the Peripheral Nerve Field Stimulator. I have pain in the coccyx/sacrum area and this stimulator was recommnded because I have localized pain and the leads are placed directly over the area of pain and just under the skin. Several times I have met with the person who does the programming and have tried 10 different ones and have had absolutely no success in relieving my pain. This stimulator doesn't reach my pain...it doesn't go deep enough, I guess, somehwhat like the tens machine, which does nothing for my pain. I'm meeting with my pain management dr again today and more than likely will have the leads pulled. They've had a lot of success with this particular stimulator, but I guess it depends on what the problem is. I don't know what my dr will recommend next, if anything.