[Update 1.5 years later: The case provides very good protection! Besides the fact that it has fallen many times on tiles and concrete from pocket height (where my heart skipped a beat until I turned on the screen and saw that nothing happened), it fell from a moving scooter at 20-30 km/h and took several tumbles and the phone didn't suffer ANY damage! Now I will order another one because the back is filled with small scratches from all the wear and tear, but it's worth the 10 euros and more!]

Quite a good case! It is well-made and has a very nice minimal design, especially for those who don't want to hide the back and color of the phone.
On the front side, it protrudes by 1-2 millimeters on the top and bottom to provide some protection for the screen (if you place it face down on a table, there will be 1 millimeter between the screen and the surface of the table). Due to the curved screen, it naturally cannot protrude on the right and left sides.
It perfectly hugs the phone around the edges and has a very nice feel in the hand, especially on the right and left sides where my curved screen is, I really like that it almost becomes one with the screen without interfering with the edge detection.
The buttons have a nice feel and are very easy to press, without taking away from the "clicky" feel of the phone's buttons.
The back is a hard transparent plastic, and that's why you would get such a case, to show off the back of the phone. As expected, this makes it prone to scratches. I have had it for 2 months and it has started to collect quite a few.
On the inside of the case, it has notches (air cushion technology) in the 4 corners to provide some protection during falls.
On the negatives: Something that didn't impress me was that it is not as soft as I expected. I expected it to be more silicone-like. The black part of the case that hugs the phone is made of hard silicone, about 2 millimeters thick, and it doesn't absorb shocks as much as a softer one. Also, due to the curvature of the screen, it cannot provide much protection for the screen, especially in a fall on a rough surface, but that's something you expect from such phones.
Finally, the case especially in the first few days slips on the back due to the hard transparent plastic (over time it gains a little more grip).
In conclusion, it is a beautiful, high-quality case with a nice feel in the hand but with moderate protection against falls (mainly for the screen).