I bought one and installed RaspBMC. It sounds great into my 561 and DSPs. I have ordered a solder on DAC board with SPDIF outs to bypass the HDMI audio etc.

Much more fun than Apple TV.

Video Sources: Cheap Samsung BluRay, Xbox One, Virgin TiVo HD
Audio source: Hifiberry DIGI on Raspberry pi running
max2play.
Music server: MacMini '06 running iTunes library
Output (3.0): G61R, HDmax421, DSP5000, DSP33C and Samsung 29in LCD