When I was riding a desk, I went to the chiropractor on a regular basis. I started using an inversion table, and my visits dropped dramatically. Back working the streets, and the pressures of the duty belt & bad car seats quickly had me in pain again. I spend a little time upside down and can usually abate the pain.
They are NOT a cure, but what is? I usually hang at about an 80* angle; I can roll and stretch as well as do some "set ups". I usually don't spend more than 5 minutes on it without a break. I may use that time to stretch somemore or some other exercises.
All I say is it helps me. I rarely see my chiro now and that's usually for my neck which the inversion table does nothing for.