I owned one for 4 years and it was absolutely fantastic for my back. It helped strengthen the muscles in my back leading to much less back pain in general and o

I owned one for 4 years and it was absolutely fantastic for my back. It helped strengthen the muscles in my back leading to much less back pain in general and overall it made me feel much better. The only issue I had was that it put pressure on my knees, which at 340 lb is not really something you want to do. Ultimately I got rid of it for a simple stool. It had the same effect since there was no leaning back and overall I felt that because of it I had a better posture.