Assembling this chair is fool proof. Ten screws and that's all it takes. The chair is quite comfortable, deep enough. It does not lift to 30" as described. It's 30" if you measure from floor to the edge of the seat. The centre is of course curved down so it's about 28 1/2 from floor (see picture). if you sit on it the cylinder will cushion down further by about 1/2" or more, depending on your weight. Take this into consideration if you really need a 30" seat height. 

It's a very good looking chair. It glides on the floor easily. Foot ring is sturdy enough, though I didn't put too much weight on it. 

It's a drafting chair. The seat tilts forward more than backward. I set it to tilt all the way back but the seat stops at about parallel to the floor. 

lumbar support is provided by the tight mesh, no actual adjustable cushioning as seen in some higher end models.Still that's quite comfortable.