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.
- How accurate was the sizing? The chair is a little smaller than expected, but fits me perfectly. A couple of male colleagues don't fit in the chair well. It's not made for someone with a waist larger than 40" or so I'd guess.
- Was the product free of any manufacturer defects? One of the screw holes wasn't threaded right, so I couldn't get the screw in place. However, it wasn't a necessary one - strictly insurance if it's being carried somewhere (never for me).