Hey there Kaworu Nagisa!
Oh I am a massive fan of Shin Seiki Evangelion. But that's not the point of my post.
When I had the T90, I felt they were a step down from the DT990. They were harsh, thin, and bass light. The treble was really annoying and really strident. The mids were more sucked out than the DT990 and the bass seemed to roll of early. The soundstage, detail, and imaging was much better of course, but the tone of the headphone ruined it for me.
You thought they were that bad!? Now I'm afraid. I've got a set of them arriving at my door in two days. I bought them because all the big reviewers said they were amazing. I really hope I'm not going to regret this purchase and have to send them back.