The installation requires a process, which, however, is completely successful if you follow the steps of the instructions.
It does not apply perfectly and the presence of the membrane is discreet (which is due to the curvature of the crystal at the edges (this is also the reason why I believe that it does not differ much from a unisex membrane).
In terms of durability, yes, it protects against scratches - rashes, but it can also easily come off if friction is applied from the sides (e.g. if you pass your hands through the sleeves of a sweatshirt)

Failure! The packaging has 3 membranes because you throw away 2 of them in the first 5 minutes and you settle for the third because you don't have another try.. not satisfied at all.. I simply wasted 10€!

It does exactly what it says. Although there were some bubbles between the membrane and the screen of the watch in the initial placement, they completely disappeared on their own within a few hours and the application looks more than perfect without any trace of bubbles. The durability and resistance to sunlight and saltwater remain to be tested, for which I will come back.
- 20/9/22. After a summer of daily use in the sea, the membrane needed replacement (the package has 3) and this is probably due to my incorrect placement. The second one exceeds my expectations and I highly recommend it.

I give it 3 stars because I haven't tried any other yet and also because the screen has not lost functionality and colors. However, it is difficult to apply without having bubbles, etc., and it easily comes off at the edges with the slightest touch.

At first, it seems to leave several small air bubbles. However, in a short time, they disappear and it applies perfectly, as if the membrane is invisible.