Also waiting for Vinboy's impressions, I am still testing Piano DAC + KaliReck. onto Rpi3 with last Rune and ACX S.S.(+ iFi iPower 5), again I had to improve my speaker croosover by adding 1.5 ohm rez. after high crossover section, not before tweeter - now it is better (i supressed area from 3.5khz to cca 8khz) .For me Piano is more open and more presence in high mids and low higs, but what I love on Piano DAC most is stereo imaging and separation, sometimes you can hear out of nowhere voices and some audio effect very close to your head, Mambo LS dont have so huge stereo imaging presence but was more subtle..more flat...