Interesting, I was just coming in to post after demoing some T1s. I'm glad you've found something that suits you and look forward to further impressions.
I just spend a few days visiting family away from home and got a chance to hear a demo T1. I'm really really considering picking one up to start with. I've got a HE500, HE400, HD600 and Mad Dog currently, but the T1 really really floored me with a number of my music choices. I have a number of "neo-folk", classical, soundtrack, ambient/electronic, field recordings, acoustic, blues and more recordings and the T1 are the best I've heard with many of what I tried out. I still prefer my other headphones for some types of music I listen to... but by god my trigger hand is trebling over a checkout option right now
The soundstage is amazing, even better the the HD600 - I truly wonder how big the stage of the HD800 must be! Eitherway I haven't heard the treble spike as anything bad at all, I don't listen loud much unless I'm listening to rock music - so it did not bother me in the demo.
Anyway, in a while I might be coming back a new T1 owner... god dammit