While the setting is at 6 bar, the pressure did not decrease, as you can see on the gauge. There is a second identical reducer, which works correctly. The installation was done by specialized plumbers 1 month ago. I hope it's a material failure!

Finally, the problem was related to the solar system, as there was an inflow from the hot water into the cold.

Very satisfied so far. The pressure is easily adjustable to the price I want. I also added a manometer to see the price, and it follows the adjustment. As for durability, time will tell.

Excellent material! I highly recommend it without reservation!

It does its job just fine.
I used it to reduce a blind leak.
I set it at 3 bar and saw a big improvement.
(it stopped water from "gushing" out of the mosaic)
Temporary solution and we'll see...
Just remember that the manometer is not included
and if you need it you have to order it separately
in consultation with the seller.

I have had it for 6 months at home with poor water quality (tds >2000) and I have bypassed the booster so it only gives that exclusively.
If it breaks, I will see it because a bathroom battery at ~4.5bar starts dripping and the network almost always has more pressure.

For now, my evaluation doesn't offer anything as I haven't tested it for enough time. I will come back.

Its good thing is that besides cleaning (as described in the manual), there is also a replacement part.

The best on the market due to its high price but worth it!!!
You forget to change it

The Gearbox is what we call "you get what you pay for" or to be more precise (since I have already changed two cheap ones).

Having used various 30€ watches that would break with the slightest impact and would last at most 2-3 years, I decided to try something of higher quality, which my neighbor has been wearing for over 6 years (that's where I saw it and researched it).
So far, the indication and function are excellent.
The durability will be evident over time.