These are nice looking and a great price.  They are plastic, not a stronger fiberglass material, but they've held up so far.  I have a huge friend who often breaks chairs just by sitting in them and these seem to be okay :).  Very intuitively packaged, easy to assemble.  I used the felt pads protecting the holes on the bottom of the seats as slide protectors for the legs.  Not sure if that's how they were meant to be used, but it works nicely.