Rectangle shade sail is definitely worth the buy.
This product is great since the quality of the material and the stitches at all the sides is well done and looks like they don’t go off that easily. Also looks like it’s very durable for the 
seasons all around.
One good thing is that it comes with accessories for the installation. The accessories are full solid stainless steel and strong enough to withstand the winds I believe . I couldn’t install on my pergola yet 
because of these crazy weathers but will update a picture once installed.