I have been enjoying the HA-160 with my AKG K702s, Grado SR-125s, Audio-Technica ATH-M50 headphones and PS Audio DLIII DAC.
I must say that the HA-160 is a very impressive headphone amplifier! The HA-160 is presents music on a neutral canvas with just a hint of warmth. There is no background noise, tons of musical detail, plenty of power, and a good soundstage.
This amp can be enjoyed for hours without becoming overly harsh or fatiguing.