Poorly designed. It is very difficult to breathe through the nose. It does not fit well at all when sleeping on the side. The silicone is very cheap

After 5 months, the silicone broke and the replacement costs 110 euros. I will buy a cheaper diving mask. It's a waste, you die more easily.

It does not have the desired fit for side sleeping, even though I use it with a special cpap pillow, that's why I deduct one star.

I loved it. Very serious matter! I use it alternately depending on my mood, with an F20 from the same company. I was lucky in choosing both. I don't think I will look for anything else

My father uses it.
It is very convenient, comfortable, quiet, and waterproof.
It leaves the entire nose exposed and we have been spared from irritations.
He used the quattro air from the same company before and we had problems with air leakage and irritation and sores on the nose.
With this mask, everything was corrected and it is quieter.