NO real glass, but still works well between 5m and 15m depth

Did the red filter can now test extensively in diving holidays.
The assembling or removing is difficult, but this is meant rather positive.
Through small slits / holes on the side can pour in well water and therefore no air bubbles between red filter and slice the GoPro have been noticing. If some games directly to the dive light Mini bubbles were present -> short filter down, wipe, and then everything was OK

Conclusion improve color fidelity:
Depth 0-5m: reddish, good only to achieve a color effect (intentional?)
Depth 5-15 / 20m: works exactly as hoped (see photos)
Depth> 20m: Advantage: the blue is richer (stronger) downside: the image (whether video or photo) is slightly darker

Not cheap, but in areas where work still enough natural light available is impeccable.
When using underwater lights of the filter brings only limited what, because the artificial light takes so looks really quite a bit of color back into and through the filter's image is the red part may again be dominant.

Let's go back about real glass:
The packaging was a bit of "Iridium Edition" and "Red Filter 2.0"
In detail, it was said:
- Lens 10x stronger treated (in the sense of more resistant)
- Iridium acrylic delivers precise color correction

Whether that's true now I can not judge, had "only" this version and not a direct comparison to the 1.0-genuine glass variant.