Received my Shade Sail and this encouraged my husband to finish making the deck! There were no directions as to how to install or even a recommendation on the easiest/best way to use. Since this was new to us  we had a bit of a struggle hanging it. After figuring out a method to hang without sag, we were quite pleased the material if really durable and has stayed strong through some rough winds. It really does provide shade while allowing light through so you are not sitting in a dungeon. I would rate this product quite high with the lower score due to lack of instructions.