Roughly it's like Audeze LCD-2 on steroids
(Very very dynamic bass - produces sound at 16Hz! slight hump around 60-100Hz, very clear midrange, clear treble)
When I only had a Senn HD650 to compare it I was going keep this and sold the Senn (yeah it's that amazing). But when my LCD-2 was then unboxed my wife hadn't seen me for months now ...
$299 + shipping
[Mod Edit |BH| Moved to correct forum]