I injured my leg and could not exercise for an extended time. This machine really helped my circulation and balance. It's heavy and not easy to move around. Once I was ready to advance, I gave it to my neighbor with a mobility issue and they saw marked improvement, as well.
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
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.
Bought this to help with balance, obviously. It does take a bit of work to master balancing on this board, but that's not the board's fault! Good size to get both feet on nicely.
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