I get 2160p24 from the AmazonHD box... I have the EDID set on the black box to only allow up to 2160p30, which is all my projector (and the HD621?) can handle, so it seems the Amazon box is open to persuasion?

UHD film looks spectacular, and certainly when I drop back to blu-ray I feel like I'm looking at a low resolution source smile Which is impressive, given that we are talking about streamed UHD. Am very much looking forward to high bitrate UHD Blu-Ray next year.

The main negative with the Amazon box right now is that it seems restricted to stereo sound. There are complaints on the Amazon forums about it. Amazon have promised an update, but it doesn't seem to have come through yet. Bought I only intend to use it until UHD Blu-Ray arrives, and as a proof of concept for UHD it works very well.