Finally got mine after the wrong item was sent to me.
They are more laid -back than I anticipated, but sound good. They are very natural sounding, I am surprised by this, I assumed they would be more like the DT990 with emphasis on the bass and the treble, but they are actually kind of balanced.
I actually prefer them with my Fosgate Signature tube amp (amp I use exclusively with the HD800) over my solid state amps, also surprised at that. The tubes add nice separation, midrange, and bass response.
A very solid, well rounded can for the money.