I bought of of these chairs for work and home and, due to spinal stenosis and I feel like they take a lot of pressure off my spine and I can rock from side to side to keep some flexibility during the day.
I"ve been using this chair for over 15 years now. I've replaced one from wear and tear and have bought another one to have at home. Improved my back pain, posture and core! Love it!
Its great...great comfort...had to put a patch of clear, moving tape over the cap that is put in after inflating the ball...otherwise air was slowing coming out...after putting this patch of tape over cap...its been wonderful.