Anyone ever try one of these back stretching machines

Used to hang there for 20 min or so. My muscles were so tight and cramped from trying to protect the injured joint they would fatigue and I would start to bounce a little as they were giving up the fight. Then there was an audible pop it felt so good. Hung for another 10 or so min get off go for a walk. Did this every day for about 4 months. For me it worked no more sciatica, no more pain meds. But I sure learned what and what not to do to protect my back. Oh and a side note you can actually drink beer upside down takes a little getting use to operating the bottle backwards but it works lol