Natural linen is true, height and seat height true; construction okay, chairs are light in weight which makes them feel a bit "cheap" but overall they look great and do the trick.  They are comfortable enough, nice thick foam padding on seats. 
They can wobble unless you follow the assembly directions exactly and have someone sitting in the seat when you do the final screw tightening - if you do this then they will sit flat on the floor and not wobble.