I know it worked when they launched and then they cracked down on things and a lot of people got kicked out.
I was planning on creating an account via the apple TV HBO Now app. I have Apple TV DNS using the Unotelly USA region. I have a US iTunes account that would pay for it. That iTunes account uses a Air NZ Airports Credit card to top up in USD and has worked a treat for any USA iTunes purchases.
Anyone else using that set up or know if that would work?