I dont have any of those, but i got the Nightowls and can compare it to the DFR. With the DFR the NO's sound a bit cleaner in the top end and highs are also a bit more detailed. You really hear, that the NO were tuned with the DFR in mind. Theres nothing really lacking. Still the Arcam drive the NO's with a bit more authority. I feel like the really low frequencies (i.e. sub bass) hit a bit harder, and the treble gets smoothed just a little bit. The Arcam rHead is absolutley non fatiguing and got such a relaxing signature, you just want to keep listening to one more song with it. Also build quality is outstanding and the volume potentiometer is world class. I really would like to hear it with some harder to drive headphones since i got the feeling the rHead will drive those really really well.