Fast delivery, easy and quick assembly, nice soft material with smooth hand. The seat is soft and comfortable, and with the waterfall edge, my legs don't become crampy or numb. Tilt, raise and lowering the chair is smooth and easy. So why 3 stars? The back of the chair doesn't come forward enough to keep my back in an upright position. Sitting with my back against the chair's back, appears that I am slouching. It is just the way that I fit in the chair, and it is very uncomfortable. I have plates in my back from prior surgeries and cannot bend at the waist. I can only bend at my hips which causes me to sit completely straight up. Even putting a pillow behind my back doesn't help that much in getting me to sit straight. This chair wasn't quite the answer I had hoped for, but it is a bit better than what I was using.