After about 5 or 5 days I really like this FlexFit™ Hyken Mesh Task Chair Black (UN59460) I sit in it about 6 hours a day. Very adjustable and comfortable.
I like the feel feel of the chair when I sit down however after sitting in it all day I find my back hurts. I do not think the seat is not firm enough. I'm giving it another week just to be sure it is the chair and not lifestyle but if I'm still in pain I'll be returning it.
I am 5'3" and have trouble finding a chair that allows me to adjust to height neck and back support specs. This chair is perfect. Fully adjustable. Comfortable. Great for those with coccix tenderness neck or low back pain. Also is really nice looking and not too bulky for a home office.