Hi,
I've used this for the Liverpool and Watford games, and registered my ticket for buy back through the NCFC website, it's then possible to see if it's been re-sold or not, which for me it was for both games. The only issue I've had is withdrawing the credit, which looks as though it maybe a glitch with the new website, but I contacted the club and they were able to make the payment to the card that I had registered.