I have this DAC and it is awesome. Tremendously detailed, great soundstage. I've compared to a lot of midrange DACs and it blows them away.
I did add the M-scaler and didn't think it provided improvement, in fact I liked that presentation less.
It has a great pre-amp function so you can run it directly into your amp.
I'm running with a Decware ZMA tube amp with great results.
Jerry