Anyone try the Breakthrough Photography X4 CPL?

[Dr. G]

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I'm thinking about picking up a different CPL for my Q.  I curerntly have the B+W Kaesemann and was wondering what I might gain, if anything, by going with the Breakthrough Photography polarizer.  It seems to have very positive reviews.

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[HighlandK]

I haven’t but find the B+W works fine - quality glass and build. I suppose my first reaction on reading the Breakthrough website was that there is a large measure of marketing hype. Call me an old cynic! I have used Hoya, Lee and B+W CPLs and in all honesty cannot see much difference. Given that CPLs are not the cheapest of filters I think I would need to find the B+W significantly lacking in some way to contemplate a change.