I have an Amazon Prime account that I paid for my daughter who is studying in the US. It's funded from a US credit card.

I access Amazon Prime using Unblock-US with no access problems.

However, and I am not sure this is a Telecom issue or not, on my VDSL2 account I rarely if ever get HD on AIV. This is on a PS3, Roku or Sony BD player.

And as noted before, the content there isn't much different from Netflix and I get Netflix in HD most of the time so I rarely watch content from AIV.