This is the chair I've needed for a long time. Having Fibromyalgia, I could only sit at my computer for a short time. Using the CANDO BALL CHAIR has allowed me to sit anywhere from 2-4 hours at a time, withouf suffering back or neck pain. I like this chair over other ball chairs because of the back support and the arms. This allows me to change positions easily. I would highly recommend this chair for anyone needing to spend long periods of time at a desk or computer...for me, it beats all other chairs I have tried.