Casing is not waterproof but camera itself is good.
Conclusions: The waterproof casing is not waterproof. My dive was max. 7,5 meters and I had already a leakage on the first dive. So if you buy it for diving be aware of this issue.
The stabilization is disappointing but maybe the latest firmware upgrade will fix this issue.
For the rest I am quite happy with the camera quality and I hope some minor issues will be fixed with firmware upgrades in the future.