Thanks useful information: 
VS
B+W
Hoya
The above is the short version. I regularly use expensive and cheap polarising filters and was curious if there was a difference. I did some testing (with a very high resolution lens, Leica APO-Telyt-R 180/3.4) which are in the link below, the long version.
Polarizing filters, do they reduce image quality?
JJ
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