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
This is my first balance ball chair and I love it! I admit, I was skeptical at first, but wanted to try it out anyway. Better than I expected. Makes me sit up straight with little effort and helps my core. Perfect height for my desk as well.
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.
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