extremely large umbrella, not quite stable

First of all I would like to inform you that I do not regret the purchase. A screen with this great four-meter diameter is hard to come by. In the furniture stores in our area, the price would have been much higher.
Why then two star deduction?

1. The first screen was torn at the seam, so had to be exchanged. This can happen but is annoying.

2. The second screen was slightly depressed when opening against the wall. Immediately a brace was bent. While this was self-inflicted. In my opinion, would such a thing can not happen when using something stronger material. Fortunately, I am technically adept. Have the hardware store bought aluminum profiles, directed the strut and strengthened.

If you have enough space when opening certainly no problem. The fabric is top. The frame material as mentioned a bit too weak.