I've been playing with my Metrum Octave DAC for the past 4 weeks, and I have to say, that it sounds spectacular. Super transparent, fast, detailed, smooth, with excellent front to back layering and soundstaging in general. It is indeed a game changing product.
No, it is not better than my uber-expensive dCS Scarlatti, which is still smoother and has even better resolution, but is not that far behind.
This DAC could sell for $5k and (fit and finish aside) could still represent a good value for money.