Overall, good chairs; everything arrived well packaged, nothing broken, nothing missing. If I did not have my handy husband and all his tools and gadgets, it would have taking me an entire day and more arthritis pains to put the chairs together - he felt sorry for me after 30mns. . 
The little key thing to tight the "screws" is too long specially for the ones close to the back of the chair and the short side did not always fit well the screws. So again, thanks to the drills and the different wrench which help greatly to put the chairs together.
One is very clanky and uneven on the floor, so we have to be careful when we sit on it. The handy man says that it will get better  the longer we sit on it. So, we'll see, but for now I'm using the chair which I know is steady and safe for me !!.