After the envelope arrived, I have first tested at Trail runs in the Pampas. GPS is not disturbed (no screening) and the BT-belt for Herzfrequentz works without dropouts.
The water test survived the envelope without any problems. Since I do not sooo many times am staying under water, I do not have long-term test of the water resistance performed -D For dives there are other cases which also deeper meters endure!
Then the more demanding test came on a mountain bike. I have a Richter bracket installed the also 6+ incl. Shell absorbs and holds securely. However, I go partly trails with many roots or "Huckelpisten" where strong vibrations at the wheel. And of course shell falls sometime the device incl. On the ground ...
Three drops were intercepted. The iPhone has come through everything easily. The shell itself is also no trace. Thank you!
Incidentally it may be mentioned that the shell is made clean and the device fits to the millimeter. Since nothing wobbles inside the envelope.
Of course (!) You should pay attention when closing out that on the one hand, the seal is clean and you put around the casing presses, thus compressing the two cups firmly. It is also helpful for the water tightness when one examines the rubber sealing rings of the lower terminals shortly. Such things are but clearly the responsibility of the user ...
So here is a strong buy recommendation from a private user.