No I haven't, so I am actually quite intrigued. I was like I said, basing my opinion on my past experience with the DJ1, as well as things I read about the Pro900, mainly from the Ultrasone appreciation thread. In fact I am also basing my opinion on Grado's with my experience of the Alessandro ms1, mspro (did audition the ms2 and left myself very very impressed too).
Not only me, but there are others in this very thread that are quite satisfied using another headphone rather than the Pro900 for metal. Seeing OP is quite tilting towards the Ultras, and that I hold a very different opinion, I just want to tell him how I feel if I were to purchase a headphone for metal in similar price ranges. All of us are giving opinions basing on personal experiences as well as referencing other's impressions.
As you can see, Ultrasones are well known (as a fact) for being a very polarizing headphone. Some love them while others really hate them. I actually liked my experience with the lower end DJ1 = HFI580, and I've seen some members commenting on them being similar in sound sig, but preferred another headphone for rock/prog metal. *I dig prog rock more than metal, disclaimer right here. I love hearing the guitar scream at me*
Just expressing my opinion~ Nothing personal, or maybe I have over-reacted. In that case,