The case with good air quality, and telephone air to keep well within. Species hooks that keep the make a little scared because you can easily remove the phone from the case. After I had a case for my NOREVE GNote which gave the same impression, yet he is never dislodge itself. So to see on the long term.
The valve allows to benefit from the Hall effect of the phone, so it's a good point.
This case I'm satisfied overall.
Edit: After 4 weeks of use, the case is still in the same state, ie as new, and the phone has not dislodged once. For me it is a very good case.