I purchased this chair for my grandson to use at his desk. He loves it. It was easy to assemble, just add the legs, insert the ball and inflate. We used a portable air compressor to expand the ball and that worked a lot better than the pump sent with the chair. But be careful that you don't over-inflate.
I purchased this chair to improve my posture and strengthen my core muscles, and I think my plan is working! It arrived quickly and was easy to assemble. The only reason that I'm not giving it 5 stars is because the fabric isn't smooth. It's rough, a little itchy, and leaves indentations and tiny bumps on your skin (if you're wearing shorts) so beware. You need to wear long pants while sitting on it. Otherwise, it's great. I love the lime green color!
Our 11 year old needed a desk chair. He is fidgety, and giving him a chair with wheels would probably have resulted in a lot of floor damage. This ball chair works great! He can move around, but the chair stays put. I would not recommend it for a large adult, though.
This seat keeps me moving and balancing while on computer. The best thing is that it allows for the all important "pelvic tilt" which allows for greater comfort than traditional desk chairs. Its not for everyone but, its better than nothing or standing all the time. I like to alternate my long time at the computer between standing and the Zenergy Ball stool.
Maybe it is just me, but I can't seem to get the right firmness for this chair to be comfortable, and if you don't have an adjustable height desk, it is likely too low to be used comfortably. On top of that, the material is very porous and doesn't seem to be cleanable. Even people's fingerprints have left marks on it from the natural oils of the hand.
My students love these chairs. I love that they can wiggle without make noise. I use these with students in grades 9-11, and they are beginning their second year. They aren't that easy to clean. I've had to replace the exercise balls inside them, but I bought cheap ones and it was a $6 fix that is holding up.