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My initial listening is through a Carrie (Mini^3) which is previously unknown to me but initial impression is a very lively sound that has been not been fatiguing at all in the first hour of listening. It has more than enough output to get me to drop my Carrie from gain 5 down to gain 2.
I don't have anything to do a RMAA test as all my input sources suck so someone else is going to have to do the numbers. Doing a laymen's noise test (full volume with nothing playing), I can't hear anything. And anyways, I don't really care about the specs - for me the most important thing is that I like the sound.