Just had mine installed, so far seems really nice although I don't like the new touch remote, good job you also get a standard one. The installer was quite happy to setup using ethernet for both silver and mini boxes. Configured the UHD 10bit colour output option and even on normal HD channels the picture is improved, the internal scaler looks very solid.
There are around 20 UHD films available to download, so caned my broadband doing exactly that
Watched The Martian (19Gb download) in UHD and the quality was a revelation.