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I am little less familiar with the MA-900s than the others, so impressions of the amp's sound will come from other phones, BUT I can say that the Vali works very well with the MA-900s - no pairing issues. Since the MA-900s are so sensitive, I could not get beyond 12 o'clock on the knob. Plenty of bass quantity on the MA-900s with the Vali. Vocals are particularly nice. So far, no issues at all other than the microphonics thing (which I think is discussed much earlier in the thread).
Interesting that the rule for optimum sound seems to be the amp should be 8x lower in output impedance then the headphones. The MA-900's are 12 ohms, and the Vali's output impedance is 6.5 ohms, however you find no pairing issues.
I guess that goes to show that rules are made to be broken
The MA900 have a resistor that was put in series before the the drivers which changes the resistance of the driver to match the output impedance of the amplifier