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Have you tried one?
There are two types, with a HUGE price difference. The one where you hang from your feet is most common, and you should be able to find them on your local craigslist for pretty cheap. They retail at something like $300-400, if memory serves.
The other type you actually sit in, and when it rotates, you end up hanging from your hips. These will be rare as hen's teeth on the used market because they retail somewhere in the neighborhood of $2500.
But... I absolutely HATE the cheaper type, because it always feels like my knees are being pulled apart long before I get any benefit on my back. The hip-hanging type immediately gets my back relaxed and decomressed.
YMMV, of course, but I'd suggest trying first.
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