I'm 42 and have had one of these for I'm guessing 12 years. Before that, I was using some inversion boots. I use this almost every evening. I got it because after heavy jet-ski riding in my 20's, I had some nerves pinched in my lower back. The doc wanted to put me on medication. The chiropracter wanted to crack my back 3 times $$$ per week. I tried my own solution - inversion. During all these years of inversion, I've never really felt a back or neck pain. Haven't had any side effects from its use. When someone new get on it, they usually don't like it. It takes your body a while to used used to being upside down. I like to invert before going out in the evening - perks you up taking a load off your spine. IMO, this is an under-recognized anti-aging device. This is a good model to buy - looks like it hasn't changed since I purchased mine a long time ago. 5 stars

I recently purchased the F5000. The construction seems good and once on the table it is sturdy. Standing beside the table it wobbles easily with just a simple nudge, but to my surprise it is very stable after climbing on.

There are a couple of design flaws that nobody commented on. First, there is a support cross brace directly behind the nylon backing, which hits directly on my lower back area. I tried adjusting heights, but it still makes contact. The nylon backing has too much give and appears to already be stretching out and I'm only 5'9"/165. The other issue is the locking ankle clamps. It is somewhat difficult to get your feet in and out with shoes on. If you are fully inverting you are going to want to wear shoes.

I think the best bet might be solid backboard with padding. However, I thought the nylon would be nice because it's breathable. As far as the ankle clamps go, straight foam padded ankle clamps or one of those easy-to-reach handle release bars might work better. I tried the Teeter Hang Up GL9500: the ankle clamps must have opened farther, but I don't remember if the cross bar was an issue. Think some pipe insulation may work for padding that annoying cross bar, but who knows. Happy hunting, it was a pain (no pun intended) to find a place to test different models and make a final decision. To me this machine isn't worth more than $150, hope this info helps you decide.
3 stars

I bought this table to relieve the pain from a pinched nerve in my neck. It worked so well, I loaded into my Honda when I visited my mom for a week. She tried it for relief of her sciatica. (She's 68 years young.) It worked so well, I left it behind for her to use and bought myself another one!

The quality is excellent. It's heavy enough to feel solid but still light enough that I can move it. It adjusts easily for multiple users. It takes up a lot of space but folds up small enough to go in a closet. It's GREAT!! 5 stars

I have scoliosis that causes painful pressure on my sciatic nerve. Using the Teeter Hang-up a few minutes each day helps relieve the pain and has enabled me to sleep better at night. 5 stars

Is a very good unit, is easy to put together and simple to fold. Very smooth operation. I would recommend, however, that if you are having back problems, you should get someone to help you put it together as some of the components are a bit on the heavy side.

Have had the unit for over a month now, and my back is MUCH better. I don't wake up with back pain anymore. I used to have "numb" sensations that ran down my legs, and a constant "dull" ache in the lower back that would never go away... but now the pain and numbness are gone.

An interesting "side-affect" of the table is that it also helps your sinuses! If you have trouble draining, just flip upside-down and get that nasty stuff moving with gravity! If you're prone to sinus-infections because it sits in a "mass" inside your head and can't drain, this will help. 4 stars