1 screw did not line up and the guy who put it together wanted to throw it away, the screw (not the chair). I sit in it all day long, and would like to take the arms off, but then it would look less like an "office chair" and my business is very conscious of this atmosphere. I used to sit on just a ball, and felt more freedom and core strenghtening. The chair is a decent substitute, but I'd rather be on a ball. Hope this helps. I also, went with this chair as opposed to the generic thinking it would be more structurally sound, and unfortunately I think it is within the same grade. Personally, I would rather have a different heavier model.
Got this item for my daughter. She uses it for ankle strength, core work and balance. We keep it in the living room and she'll hop on while waiting for me, watching tv or just for a couple of minutes here and there. The price was fair, quality great. Just what we were looking for.
After several months of lower back pain, I learned through visits with various specialists that I just had weak muscles in my core. After one week on the ball chair, I'm already feeling like me again! I've also noticed my posture is better overall - even in seating where people typically slump.
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