: good price, decent power, slightly warm sound the adds flavor to some headphones, tube roll-able, balanced.
: the stock tubes aren't the best but definitely good enough for the price, the single ended output isn't really good compared the balanced one
this is a great balanced tube hybrid amp, if you have a headphone that sound great on tubes, this amp will add a good flavor to the sound without costing so much, i have the hd6xx and been using it balanced on this amp and i like the sound pretty much, note that the single ended output isn't that good, i would recommend feeding the amp with a balanced dac and using the balanced output of the amp if you can as it is much better in terms of sound.
how refined it sounds. $100 headphone amps are not supposed to sound this good.