I have one and use it regularly - several times a week. Teeter brand. Daily when the back acts up. I bought mine following a mishap resulting in a compression injury to my lower spine. A buddy with severe sciatica was using his and claiming good things from it. Before ordering one, I set up a make shift inclined board for myself that I used several times convincing myself that it worked. Within a week of starting to use it, I noticed the stiff neck (diagnosed degenerative disk disease of the the c4-c5) I lived with for several years went away. I think it helps my lower back as well. I gradually worked up to hanging fully suspended. I wear shoes when hanging. I will hang anywhere from 3 to 10 minutes. I worked up to the ten minutes when I first started using the inversion table. I think I get just as much benefit from 3 to 5 minutes. when I feel energetic I will do torso rotations, crunches and back extensions while inverted. Some times I get the head rush while hanging, usually doesn't bother me. If I skip doing stretches after working out at the gym, I promise myself I will hang when I get home. sometimes I do.