I received the 7 day trial from Abbott and I can tell you first had that it absolutely worked for me. I have a trashed back with several bulged disks, fractures, and have had 1 herniated disk and a decompression surgery on L3,4,5 that failed. My leg, hip, and lower back has been horrendous. During the trial the pain was gone in my leg and hip. One spot in my back gave me some pain but tolerable . I am set to have it implanted because after the removal the pain has returned. I absolutely recommend the Abbott implant nerve stimulator.