Great build quality and very heavy !!! , most people complaint that it wont drive high impedance headphones but i didn't have any problem, i could drive my HD 6xx just fine!
ElCapoNinjaIt's the opposite actually. People complain that it won't drive LOW impedance headphones or planars, which it won't. It is an OTL amp which specifically benefits high impedance like the HD 6xx which is a perfect match.