I love these chairs for many reasons.  First, they are extremely comfortable, supporting your back in the right place.  Secondly, they are quite durable and won't collapse when a large adult sits in them.  The feet on the legs are large enough so they don't sink into the lawn.
The stacking feature is great.  I can put 2 or three together and haul in my car to the beach or parades.  Also, since I don't have a patio, I leave them stacked in the yard when not in use.  They are easy to move when mowing the lawn.  Their size was an issue for winter storage.  I have pretty tall garage with a floor laid on one half over the cross beams.  These chairs will just fit between the beams so they can be handed up to the second floor.
Price was a little high, but very nice quality.