I have a Musical Fidelity MX-DAC and Musical Fidelity MX-HPA on the way. Let's see how it does vs the zdac v2 - hope I hear a big difference for big price difference heh.
They sound great with my MF M1 HPA, fed by the DAC out of my Audio-GD 10ES. I also have a MF V90 that I have not tried with the HD700. I will try tonight and report my findings. Who knows, maybe MF amps and 700s are just meant for each other!