It took 6 fathoms(36ft ) in stride and the lens is crystal clear. I wish the mounting bracking was notched to fit the Gopro mounts, but I worked my way around that with zip ties. The shipping was strange, got sent back to miami after crossing the border, extending the shipping time, don't know if that was an error on the creator company or shipping company, so I'll leave it there. No documentation, but it's not needed, it's very simple, hex head machine screws and a hex wrench, be sure to close it tight to make that O-ring seal. for communication, I was made to wait over a weekend when I asked a question about the mounting holes since the answerer didn't know about it , but they finally sent it to me the following tuesday(asked thursday, they answered late friday without the answer and sent me the answer the next tuesday). if the question was urgent, I would have given them a lower rating.
otherwise, I'm happy with the product, looks capable of what it's intended to do and can't wait to test it out at 40-60 fathoms(240-360ft) in july, I'll write another review when that time comes.