I've had an inversion table for over five years now, use it every few days. I like the feeling of decompression in my spine and the blood circulating. I don't have back problems, so not sure what to say about yours, InActionGirl, but I wouldn't think it would hurt.
You can find them for around $100-150 anymore on Ebay or your basic sporting goods stores. I wouldn't get suckered into buying that Teeter infomercial one, theyre all basically the same.