I opted for the HOYA Pro 1 CPL, but I'm afraid that my experience with PhotoBuff has been unsatisfactory, and unless you can pick the goods up in person, I would be very wary of purchasing goods from this firm.
My experience with them was that a HOYA 58mm Pro 1 CPL I purchased was mailed in a regular paper envelope (the sort used for general letters). I was charged $7.49 ex GST for delivery and registered post, and I expected that the goods would be appropriately packaged, eg. in an inexpensive small padded envelope, or similar. The paper envelope was insufficient and was not designed to take the contents, so not surprisingly the flimsy envelope arrived with a large gaping rip in the front and rear of the envelope. The rip was so extensive that it was not necessary for me to open the envelope to examine my purchase, instead I retrieved the filter through the gaping hole in the paper! When I contacted Zoran about the matter, he made no apology for the use of the paper envelope, so this indicates this is standard of 'packaging' you can expect.
It is a joke to see on their website... "and we use a variety of packaging materials to protect the products you've ordered. "
(PS. I'm not against grey market guys in general... I've purchased quite a few things (body, a few lenses, and flash) over the years from a grey market fellow located on the coast and I've been very happy with the goods and saving $$$$)