Brutality, check! I absolutely do, for the tracks I've tested so far. A few more in-depth thoughts:
The impact is really awesome for double kicks. I'll admit, I was a little worried at first when I heard how much rumble it had in the subbass (and the slight one-noteyness I mentioned earlier), but the midbass punch is so hard, it completely overcomes the very slight looseness in the subbass region and keeps the music feeling really tight. At the same time, midbass seems to do a really good job of staying clear of the lower midrange.
Attack, decay and seperation are pretty strong... I mean, I threw on Spawn of Possession's "Where Angels Go, Demons Follow" and I felt like each note was pretty punchy and distinctive. This attribute would make or break the headphone for me in many ways), and it definitely passes the test.
Guitars have good energy and are presented in a way that isn't overly colored. Production that is really hot in the upper mids can get a touch fatiguing (but again, this is right out of the box... I've found this frequency band often improves appreciably with burn-in).
Really liking it so far. Will definitely be posting more comparisons, etc on the metal thread later.