I have had it for over 2 years, I use it quite often, I wash it at 30°C and it hasn't been damaged, it is still waterproof, there is no leakage from my daughter's nighttime enuresis. From this perspective, I am very satisfied! It is very thin and soft!
As for the noise, on all the covers I use, I put a cotton mattress cover on top and then the sheet (so a total of 3 layers)... therefore there is neither noise nor potential heat in the summer. (Yes, I collect a lot of laundry though...)
The only negative I find in all the covers is that they gather/loosen over time at the width, so if the child sleeps at the edge of the bed... we are in trouble... If the skirt were made of the same material, this problem wouldn't exist. For this reason, I have concluded that I prefer those with elastic and not with a skirt... because I get them larger so I can tuck them under the bed... Everyone has their own "hacks."
But as for the quality of the cover, I am satisfied!

After about ten nightly "accidents," I can say that it does its job very well. Not a drop passed through to the mattress. Also, there is no sound of plastic when you move, like in other waterproof protectors, and additionally, your body doesn't sweat from the nylon. I sleep many times with the little one and I can give an opinion. I will buy a second one at the first opportunity.

Unfortunately, I was not satisfied with this specific mattress. The border is less than 30 centimeters (at least in the ones I received) and the elastic is loose, the fit is not particularly stable. As for absorbency, it is almost non-existent. If water falls on it and I don't remove it immediately, it penetrates the mattress within a minute and wets the bed. And it has happened more than once.. On the other hand, in contrast to their absorbency, every time I have put them in the washing machine, they have not suffered the slightest damage or distortion of their seams, they are very durable and I have had them for 2+ years.

I am super satisfied! The quality of the materials seems great, it didn't suffer anything in the washing machine. It stays very stable on the mattress and the main problem I solved is that the sheet doesn't come off its place.