Well, they arrived at 9:00am this morning. Took the day off work! Box and packaging is superb. Build quality is very impressive, solid, weighty and ooze quality. The cups are bigger than I expected, which is a good thing. Fit is great, not too tight but secure.
Test tracks so far (at 320 kbps rip from PC via an Arcam rPac):
Counting Crows - Good Time (separation of the instruments is superb, stereo imaging fantastic, bass tight, bright treble but not fatiguing, vocals sound 'in the mix' and part of the song rather than forward on my AKG450s)
Rammstein - Rammleid (heard some detail here I've not heard, controlled slam of this very heavy track, superb)
Taylor Swift - We Are Never Ever Getting Back Together (bass run I've not heard before, power of the bass drum really kicks here but tight, and turns the track into a really foot tapping monster)
Fleetwood Mac - Never Going Back Again (acoustic strings very clear)
Jethro Tull - Thick As a Brick Part 1 (nice treble, clean)
Rush - The Garden (strings are vivid, 12 string guitar sounds great)
Ludovico Einaudi - Oltremare (piano keys sound weighty, thick, real)
Node - Clock (detail is superb, bass tight, some detail not heard before)
Synth.nl - Antartico (perfect bass)
Nicola Benedetti - The Lark Ascending (RVW) (sublime)
Rush - Tom Sawyer (perfect - a track I've been playing since 1981) The Spirit of Radio (ditto 1980 - super)
Bon Iver - Perth (unbelievably good, horns are so clear)
Fair to say I'm keeping these. The wait is over. They're a Baumgartner from the AKG450s, ATH-M50s, Senn HD558 and Senn HD600s in my opinion - one giant leap!.
Thanks for the advice chaps.....esp. Dale.
Very happy.