This chair lets me sit up straight, similar to the kneeling chair but with more mobility. It's an excellent task chair. I've had no trouble with it rolling and rarely need to add air. I've been using it for over a year and love it. It has a bouncy quality that helps me feel less tired. Perhaps the one and only unusual aspect, is if you're wearing shorts the ball will be stuck to your skin when you stand up. My kids find this hilarious.
My sister and I both bought GreenWash Balls at the same time, and independently, came to the same conclusion: Our laundry has never looked or felt cleaner. Her house is on city water, mine, well water. We are amazed and happy.
Someone mentioned skipping the rinse cycle and I'll try that today. Get this ball, you won't be disappointed.