These chairs are BEAUTIFUL but narrow. A large person will have their bottom hang over the sides.  I like the look but they are really small and after a few days of sitting in the 3 we put together as a test, they started to feel a bit wobbly with the swivel seat.  The assembly was really easy.  I did it alone.  There were only 2 washers but 4 screws  to put the base on the chair.  

I had ordered 6 but returned 3 because of the potential wobble.  But the look is really nice and modern.  If they were just a wee bit more stable and wider in the seat, I would have kept them all for my kitchen.  I just don't trust they will do well with high use.  The place I will put the 3 I kept will not get as much use as my counter top kitchen table.  I am giving it a 4 even though they may not last....they are really nice looking.