We got my wife one before she had her back surgery. Does a great job of relieving pressure on her spine in the area of her injury. She swears by it.
Years ago I used to have all kinds of lower back pain. My back would go out, but after a few days I would recover....until the next time. It didn't seem to take much for it to happen again.
After one bad time, I went six weeks in pain with little relief. Had taken so much ibuprofen that I had prickly red dots all over my skin.
I don't know what possessed me to try it, but I got into a recliner chair upside down. My hips were up on the back part of the chair with my feet in the air and my head was where your feet go. I stayed that way for about 20 mins. It hurt but I could feel the stretching in my back. Later that evening a lot of the pain was gone and completely gone the next day. (not sure you should try that, it wasn't easy getting out of that chair).
You should invest in a good one of those tables if your getting results. Have you checked Amazon?