Firstly I want to say the opus1 was one of my favourite Daps I have ever owned, excellent build, light, 2 X slots and sounded excellent.... but I feel that was for its time, I have had numerous daps, dongles, sources since then, and some of the cheaper more recent ones just blow it out of the water for Audio , dx160, hiby ru6 to name but a few.... tech moves on at an alarming rate and even some of the cheapest daps dongles stand up and in some ways better , hiby r3, hidisz ap80 proX, btr,5 again to name a few.... opus1 will always have fond memories for me but tech does indeed move on.