very poor construction... it lasted 2 months for me before it fell apart... the equivalent from temou is more sturdy

Practical and convenient. It serves its purpose for the cost, it requires attention when opening and closing, but overall a good choice.

I've had it for about a month. Okay, for €4 sun protection, don't expect anything crazy. Having read the reviews and being quite careful, I haven't had any issues. It goes in and out easily, but you have to find some trick to do it quickly inside the car (I open it to about 2/3, put it in place behind the mirror, and then open it fully because it doesn't fit stretched!). The metal spokes are flimsy and will break, but I'm sure it will last through the summer, and if I'm lucky, maybe a second one. So far, I prefer it over sun protection that, when they "wrinkle" and start to fall, drives me crazy. I'll give an update when it breaks.
Update [10/09]: 2.5 months after purchase, the first "spoke" actually broke. Now the umbrella opens, but a little piece of fabric (a small corner) is hanging and doesn't cover. I would say it's expected; I won't change the €4 (one for each euro xD) and I still use it. It won't last a whole second summer.

Truly, it is one of the smartest purchases I have made as it covers the entire surface of the windshield. Easy storage and comfortable to install.

Good is very good! Of course we all would like it to be more durable because it is not!!
A summer if it suits you is great!!