I love 4 things in headphone, wide soundstage, low distortion, fast decay, tactile bass. This UAE1 I expect will be absolute banger, becose it will have biocellulose drivers. Bio cellulose drivers are best headphone drivers on earth IMO becose they combine the moving mass and tactility of dynamic driver with low distortion of planars. Then combine that with chassis that is very open, that means it will have fast decay, no ringing. To top it all off, Grell made HD800 which is best widest soundstage I ever heard and this with its extreme driver angle will most probably be even wider.