Well the Sphera has a plastic lens too, and the flex is a rather welcome thing. The only thing, that flex degrades the mask faster, but that's ok. The flex lets us equalise the mask deeper that we would if it were a glass lens in place.
This Raven mask looks cook. I especially like the colour. Although it does look like a knock off of the Sphera. I would say it's definately good down to the depth you require; 30 feet.
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