We love these chairs!!  Very good quality, nice size (we both are average height), back of chair not too far back.  They are very comfortable.  
We very carefully lined up the holes for the pins and tapped them in with a rubber mallet.  Be sure you pull up the back section of the chair when unfolding.
One of the arms was off when we received.  Fortunately, my husband has an extensive tool collection.  The screw head required a square tip.  Many would not have this.