the vibrations were lost, it can't be heard at all

I installed them because my neighbor in the adjacent apartment of the building was complaining about noise he was hearing inside his home, which was coming from vibrations transmitted through the walls from one of my air conditioners. After installation, he told me he can hardly hear anything. .....

they did a very good job

They do a good job as long as you don't tighten them too much so they can absorb the shocks. I recommend them

The air conditioner stopped aligning with the wall. I tightened it slightly to avoid hardening. I also bought an extra set of four to have. I recommend it.

It does what it says. I solved the problem with the motor noise on the wall. You can't hear anything on an 18-inch and a 12-inch inventor. Easy installation with a 14-inch wrench. The machine lifts about 5 inches when you put it on due to the rubber.

Get it with your eyes closed. I think there are better ones but also much more expensive

I ordered a different product, but a different one arrived. As you can see, what I received has nothing to do with the one pictured, different shape, different color... even a child can understand the differences. Also, if I wanted these specific ones, I would buy them elsewhere for the price of €10. Pure disappointment.

UPDATE 13/7/2020:
The purchase cost was €15.

The difference is noticeable.
I have an Omnia 9-inch fan installed on a wall mount in the bedroom.
I placed them between the mount and the external unit, and the noise made by the external unit on the wall has been greatly reduced.
The purchase is definitely worth it.

Attention, they require a light tightening.