So, got some listening time in yesterday.
I must say i'm more impressed than i would have thought. Especially in direct comparison to the DT770 the added extension in both the low and high end is unreal. The Beyer sounds compeltely muffled and unengaging in comparison. Currently, especially at higher volumes, the high end is a touch to much, but i feel a proper amp might make that better. I was a bit concerned because many say the lowend isn't as tight, but i'm really happy with it. Even with the fastest metal stuff i don't feel the bass loses it to much.
Also, i'm surprised how "easy" it is to drive. Even my Onboard audio is perfectly capable of pushing it to "high listening levels". Overall, i'm incredibly happy with that purchase!