Yeah I built a balanced one. This amp is seriously good. You don't even realize it's powered on, dead quiet. There is no shortage of power, approx. 7W into 100 ohms, and I can't even measure the output impedance with a standard DMM. Music is effortless, airy, and is the most transparent headphone amp I have never heard lol! I am currently using it with just the DA8's preamp output, but I can tell it deserves more. I wouldn't hesitate to put this in front of a much costlier DAC. Bass is also incredible, but it has no bloom, so what you get is exactly what your DAC is capable of. It really is a gem, and I can't believe no one else around here hasn't thought of getting this amp. It's also quite small, and I am wanting to put either a Khozmo or Alps quad pot inside the box. If I was to sum up this amp in one word it would be "pure".
Best,
Brunk