Another happy user of combo: RaspberryPI + HiFiBerry DAC.
I have been using my set for couple of days and so far I only struggled with AirPlay functionality. It tends to freeze after few hours of listening via Deezer app. on iPod Touch 4g (iOS 6.1).
I would really like to see in future releases of Volumino a support for Deezer.
Great job guys. Keep going!