Did have an issue with
Did have an issue with its inputs at first, but APOS was extremely responsive, and I received a new working unit 30 or so days later. FYI - the resistor (huge and white) that sits behind the tubes started to smell and slowly discolor as if burning, but APOS informed that this is normal, and to date I’ve had ZERO issues with the replacement until.
Regarding performance, this unit is sweet especially when listened through the Apos x Audio-Technica ATH-R70x cans. Sound is very detailed, full bodied and naturally balanced. Highly recommend over other headphone amps costing considerably more. I am also expecting my Merlin DAC to arrive soon, and I am sure the sound will be elevated even more. Good job knocking it out of the park APOS, especially at these price points!!!! :))))