These are wonderful!  I have purchased several of them and they are doing their job.  I have weather exposed chairs and a fire pit.  The covers keep our furniture dry, protect it from the sun and clean for now and then outdoor seating.  They are nice looking, made from a durable fabric, waterproof as advertised and easy to secure.  When strapped properly, they will protect your furniture from high wind, driving rain and  everyday outdoor elements.  

Pros: Waterproof, attractive, easy to use, reliable.  They come in many sizes and for many furniture pieces.