Haven't really spent enough time on it to form a definitive opinion yet. It is slightly hissy but won't be a problem unless you are on a hiss prone IEM (SE530 for an example). Otherwise it is quite good sounding. It is a hybrid amp so there is an opamp buffer stage and you can roll the stock MESUE8820 out (one OPA2604 is included). Overall my impression is quite positive.
I am torn between waiting for the DX50, buying the Sony PHA1 or even that Venturecraft Soundroid... aand for this one.
However, I am looking forward to your impressions in this forum.