After several months of lower back pain, I learned through visits with various specialists that I just had weak muscles in my core. After one week on the ball chair, I'm already feeling like me again! I've also noticed my posture is better overall - even in seating where people typically slump.
This chair makes me to maintain good posture and use inner muscle. It is more comfortable than just sit on the balance ball (and you can sit down on it much longer).
Very comfortable chair that will fix your core and lower back issues. Purchased one, tried it for a few weeks at home and I'm buying the 2nd one for my office. I saw it first in one of my coworker's place and she loved it. Inflate it to your preferred comfort level and enjoy being sitting down in the most healthy way. The only thing I'd like to see would be the availability of other different colors.
I love this chair! It helps with my slouching and my leg-crossing, both of which I am always working to stop. The only downsides to this chair is that I have to re-inflate it every few months, and the breaks on the wheels are easily tapped, which is irritating, and one of them has already broken off (likely the fault of a student, but anyway). The final thing that I found problematic was that this particular chair was too short for my desk, and I had to purchase chair leg extenders from http://www.gaiam.com/product/classic-balance-ball-chair-leg-extenders/95-1561.html
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