These are very sturdy and only take 5-10 minutes to put together. I was happy that everything I needed was right in the box. I love that they go up and down, but also have a tilt lock for when you need to stretch your legs. We ordered 6 of these for our office and have been quite pleased. If I could wish for one thing, it would be a little more padding in the seat (gel maybe?) Overall I am quite happy, and couldn't beat the price on such a stylish chair.