I've been using this for a couple months now.

Setup was perfect, as per the instructions without anything weird popping up (which has happened on every other Pi project I've done)

Streaming FLAC from a network drive was jumpy, so I bought a USB drive to plug in which is loaded with my FLACs.

The Pi is plugged into a Scot Nixon USB Chibi DAC, and then a Rotel 1080 pre and power amp.

I did some A/B tests comparing the Pi to an Airport Express running RCA's directly into the pre amp, and the difference is huge. Lower noise floor, much better separation, and a lot of detail. I'd suggest anyone who's wondering should give it a go. Also the mPad app on iPad and iPhone works perfectly.