Quite good quality even though it is the first time I come into contact with such a sunshade and I have no point of comparison.
Disadvantages:
The bigger it is, the more it sags in the middle (you can't stretch it all the way because you don't know its limit and when it might break).
It is perforated but with very small holes and the rainwater doesn't have time to drain, resulting in... more sagging.
The fabric gets soaked (absorbs water) even in light rain as if it were... woolen, making it even heavier.
Honest sunshade for its money (satisfactory surface for a car).
Either you give it a big slope (and by big, I mean big) on one side so that the rainwater runs off, or you rush to take it down when it starts drizzling.
It provides good shade for the price and blocks a lot of heat (from the car). If I leave the front windows open by 5 cm, I can get in at noon in July without suffering... heatstroke.
The rope it comes with is a joke, so you get your own (at minimal cost).
For wall supports and tensioners, budget about 15 euros.
If you want to raise it higher, you need metal poles. I used 40 x 40 mm x 2 mm thick. Four meters cost about 15 euros. I had a welder and welded it to the fence (it worked well for me). Generally, if the walls and the fence of your house don't suit you and you need to buy several meters of metal, the extra cost can easily (very easily) exceed fifty euros.
In strong wind, it doesn't... hold up.
These are my impressions after 2 weeks of use.
If I notice anything strange, I'll update.

UPDATE 17/7

After a month, all is well.
In a short downpour when I wasn't home to take it down, when I returned (it was still raining heavily), a considerable amount of water was passing through the center (it had sagged quite a bit).
The good thing is that it hasn't loosened at all
(when it dries after rain, it returns to normal by itself, eliminating the sagging) and I haven't tightened the tensioners again.
As for the wind, as I said, it doesn't hold up.
There are bird droppings that show from underneath as stains, but you can't clean them easily.
When summer is over, unless something unexpected happens, it will be washed in the washing machine and stored.
If I see anything else strange, I'll update.
If it lasts the whole summer, it will have paid for itself.
The review was based on the purchase price. At 30-something euros, it's silly to expect the shade to be equivalent to... a tiled roof. It blocks enough heat that you can get into your car at reasonable temperatures. It's not for putting a table and having your coffee at noon when it's 40°C.

UPDATE 12/9

It's almost three months and all is well. Fabric and rings in excellent condition. I tried to put it in a 7kg washing machine but it was too cramped. So I spread it out on the yard and hosed it down. The bird droppings came off easily as they had dried. It was folded and stored.
To be honest, I didn't expect it to last the whole summer without... losses, not so much because of the rain but because of the wind.
It paid for itself and, God willing, we're going for a second summer.

UPDATE 20/5

Second summer, then.
It came out of storage and was set up exactly as last year.
It's intact. I have the impression that we'll get through this summer too unless something dramatic happens. I'll update.

ATTENTION: When it's very windy (over about 4 Beaufort if I can estimate), the fabric flaps quite a lot. It can go up to about 40 to 50 centimeters above or below the resting position. In my case, I estimate this happens because I have put over 1 meter of rope on each end and there is quite a bit of slack. I can't stretch it more because I'm afraid it might tear. Of course, nothing has happened to it as I have mentioned. However, I say this so you leave enough space from the car's roof. This is because most cars have the antenna on the roof and if there isn't enough space, with the swaying, the antenna could pierce the fabric. And then it will unravel like... a sweater!!!

UPDATE 25/8

The second summer is ending. It is intact, as if not a day has passed.
The truth is that this summer there was hardly any wind (calm most days) nor rain (except for one day when it dropped 10 drops) to say it was worn out.
At the end of September, it will be washed as last year and stored.

UPDATE 16/11

It was washed again on the stamped concrete and stored. It is like new. We're going for a third summer, God willing.

UPDATE 1/5/2025

Third year then...
It was placed again in the same position. Stretched as before and even took the first good rain.
It behaved as always. I bet it will last this summer too unless we have disasters.
And even if it breaks tomorrow (which I don't think), it has more than paid for itself. If something goes wrong, I will buy the same one again.

Update 24/9/2025

As you can see, the problems have started...
I estimate it's from the stretching and of course from the fact that it has completed 3 years.
Conclusion: don't stretch it to the maximum, just enough.
Second conclusion: I have already ordered the same one but in a smaller size.
Third conclusion: We buy small fabrics and many, not one big one..