Extremely happy with this comfortable & sturdy, well-designed chair!  Assembly is straightforward if two people work together: some of the angles of attachment make it tricky to line up the bolts if one person builds alone.  And yes, don't tighten the arm bolts to the back piece until you have the seat attached, another reviewer mentioned this and it was helpful to know.  The chair is a good weight, fittings are secure, and the mesh seat has a really nice level of cushion, very comfortable for long-term studio work.  The height adjustment lever works very well, nothing is flimsy, and it has a clean, modern look.  Arms swing up and down smoothly, no slipping.  Makes desk work more fun!