These chairs are very sturdy.  The HDPE is solid, not your typical resin, and looks like it will be colorfast for a long time.  The seat is very firm and comfortable, though my first impression was that the seat was a bit short under my legs.   The sling is high quality and seems really durable.  I ordered two chairs that came stacked in one box.  Unfortunately due to their angle, the top seat broke through the very thick box and arrived with scuffing on the front where the sling is (skinned knees).  The stacking is convenient, and will be very heavy to lift more than two at a time.