And how much less should it cost..?
The issue is that from the first month, buttons, flanges, everything flew off. Failed purchase and bad choice.

Instead of receiving a chrome-silver (like in the photo), I received a plastic white-blue (awful color) that doesn't match anything... totally random... wasted 20 euros (I bought 4)

This particular one is excellent for anyone who desires strong water pressure in their shower. Even in faucets with low flow, it increases performance. I had it before, it broke, and then I bought another one from the same company thinking it would be equally good, as Viospiral has many similar products that are easily found in supermarkets. However, not all of them have the same performance. There are products that, even though the faucet has strong pressure, the showerhead doesn't perform at all. Fortunately, I finally found it on skroutz and it is perfect. It is small in size, simple, without switches or additional functions, and with excellent pressure.

Excellent value for money (possibly even excessively good value for the quality). The downside is that the diameter is a bit small compared to what I had in mind when I ordered.