Well I had the dx90 and heard the dx80 for a bit. I can say the R3 holds its own. As I said before I like the sound of the newer ESS chips, slightly warm but still plenty of detail and good layering. Sound stage is a touch smaller but I really like the overall tone of the R3. I don’t like pure neutral or analytical. I like a more musical presentation. And I think R3 does a great balance between the two it’s detailed but not too sterile sounding. Only slight niggle would be lack of power compared to the ibassos.