I just bought the 900E after a serious comparison with the 850E. It is by far worth every extra $$$. The picture is nothing short of amazing, and the best contrast you can get without going OLED. IMHO the best 4k HDR LED TV on the market.
Nice to see some x900e love on this thread. I bought one a few weeks ago after going to best buy to buy an 850e. There is a noticeable difference in quality between the 65x850e and the 65x900e that easily justified the $300 difference. The 930e ($1000 more) gets a little brighter and the 65a1e ($2000 more) oled has better absolute black level but the 900e is 90% as good for less than half the price.
Best Buy has the 65x900e on sale again for $1799.
[doublepost=1506483665][/doublepost]to the OP original question - I preordered 2 ATV4k and my card was just charged so presumably they will ship soon. That said, I'm likely to return them. We subscribe to Amazon, Hulu and Netflix and I have an extensive Plex library and some iTunes purchases as well - I was hoping to have one device to cover all of it but I'm disappointed by the reviews of the forced upscaling and synthesized HDR unless I change settings for every different piece of content. And the lack of Atmos capability and not having Amazon at launch is ridiculous. Dear Apple, let my content play out natively so my receiver and TV which have far better processing can do their job.