Ordered 2 of these to test drive (ha) in the office. So far, now I have ordered 8 total. They are great chairs for people who sit all day. At first it might feel a little 'interesting' but then they become a solid chair. Our engineers love it; I tease them that I may find a seat belt accessory some day to strap them in for incrased productivity. Assembly is about 15 min each - and easy. Hardest part is if I'm using a hand screwdriver vs an electric one for the 10 screws.