Hi Brendan, I'm now working with the Pola Pro polarisers and find them to be fine. One arrived with a tiny scratch but was replaced without quibble. They also sold me their stronger (as in cuts out more light) polariser separately rather than in the pack which I didn't need. They seem quite flexible in this regard if you contact them. The weaker of the two polarisers now mostly lives on my camera and, obviously, makes a significant difference in terms of both colour and knocking the light back so I can film around F5.6 on a sunny day (optimum with this camera.) If I'm only using an ND it's usually a B & W 103 which knocks out 3 stops but I expect the PP equivalent would be fine, too.