We've purchase 3 of these chairs for our call center and the staff loves them. They sit in them for up to 8 hours and they state that the chairs support their back and are quite comfortable all day long. Our staff range from small to large in body size and all find it equally as nice.
The chair must have lasted 3 weeks. About then the chair started to wobble. The clerk said 6 of this brand had been returned already due to the same problem. Avoid this chair!