I have been using this unit for around 6 months with K7xx and Hd6xx. While the amp section is great, the dac itself is a terrible performer. It has no attack and has poor dynamics and details. When I feed it dsd signal (through Audirvana) the dac performs even worse. Now I have a Aune X1s (occassionally Fiio X5ii) feeding signal to this unit and this combo is pretty good. However if I wanted just a pure class A amp, I could have gone with Nuforce HA-200 (in fact I've ordered it too).