I use the Teeter Dex 2 that they have at my gym frequently and really love it. I have some spinal compression due to 3 separate accidents. I can not tolerate treatment like a chiropractor but after warming up well I hang upside down for awhile and then am able to self adjust and relieve all my pain. I routinely end a workout (after cooldown) with it.
That being said, no way would I pay to have one in my home. I do elbow stand against a wall for gentle decompression (not as effective) but the inversion stuff takes a lot of room. I think if I really really wanted to have it at home I would do the chinup bar variety.
MTA: because it is rare I dont have more to say
"When I got too tired to run anymore I just pretended I wasnt tired and kept running anyway" - my daughter Age 7