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Title: Not for prolonged sitting
Review: I like the concept more than the product itself. I tend to sit at my computer for hours at a time and don't take many breaks. This chair is comfortable for the first half-hour or so and at that point my experience is general soreness of the tail bone, "nether parts," and the small of the back. As you can see from the product description, the ball itself is plastic. Plastic does not dissipate heat well. In addition to soreness in said nether parts one may expect to experience some localized sweating. Perhaps a towel on the chair would help, though I've not bothered--I'm back in my old wooden chair (with pillow!) in my search of a better office chair.
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