Yesterday I verified my PayPal account with that PLN Visa card. All fine. I loaded my PayPal by Bitcoin through Virwox exchange and tried to do a withdrawal to my card, all seems fine as well, my PP account didn't get limited, withdrawal hasn't arrived to the card's IBAN yet, but that's normal since PayPal always holds funds for some time for new accounts.
These cards are working like he said they would, great work. Definitely gonna buy some more in the near future.