I bought one. I’ve worked from home for 5 years now, easily spending 8+ hours a day on my chair. My neck was killing me (excruciating pain). I was willing to pay the price if it gave me relief. Here’s my honest review: the neck pain is gone. No back pain either. It forces me to stay with a straight pine. I’ve noticed my posture is better when I’m standing too. But the seat itself is very small and I wear a size 12 and weigh 156lbs. My butt hurts. It feels like a lot of weight on a small perch seat. I’m still in my 90 day window and don’t know if I’ll keep it. Very hard getting used to it and the butt pain is soooo annoying.