AMAZING! I got rid of my special sitting pillows. I work from home and sit 10, 12 and sometimes more hours per day. My back, sitting bones, and tail bone used to hurt all the time. My legs used to get numb. No more! This chair is fantastic! It allows for the natural movement and I feel by back crack every day now. I am no longer fatigued from pain and numbness. Absolutely love it and recommend wholeheartedly!