It is very noisy when windy days, there is no possibility how to attach it to the wall. After first rain all water has been collected in the middle, which stretched the sail ugly.

Purchased as a semi-permanent solution for pergola shading. Initially, an HDPE fabric was tried but it failed us after about ~11.5 months.
The problem with this one is the lining (seam all around), which is stretched, leaving sags in the middle of the fabric as shown in the video. Such fabrics must have more tie points than just the four at the corners.
I wish I had known it would sag before buying it, as I did not intend to take it down in September, but now I will be forced to as the first rain will likely tear it.
PS: If the corners are stretched any further, they will tear. It's not a matter of stretching the existing 4 points.
PS2: Of course, it only took one heavy rain for it to form "breasts," so it was uninstalled for the winter months. Worth mentioning and unexpectedly positive is the fact that the material of the fabric was not deformed or altered at all by the considerable weight of water it held.

I got it as an alternative to the awning on the balcony, as the price is 90%(!!!) cheaper than an awning. So far (10 months) it has shown quite good resistance to strong winds. Aesthetically also very nice and original, much more original than an awning. If you made it with a patent, you could lower it when the wind is excessively strong, and then you would gather the awning. From a temporary to a permanent solution, it is a good choice.

Very good product. Durable and user-friendly. I use it for car shading. I highly recommend it.