I am in possession of the amp, finally! I will post impressions tonight. My dealer also loaned me a balanced cable for my HD600s so I can test it single and balanced. Basically it is just a stock HD600 cable with an XLR.
I have a great setup but unfortunately my headphones are not the best. The HD600s are good but have limitations. I do not expect miracles but I do expect an improvement. This is to the lay the groundwork for better cans, probably the Grado PS1000s.
I also picked up the Ayre break-in disc so I will be running glide tones and brown noise through the amp while I am at work to speed up the break-in process, although the one I heard in store sounded GREAT right out of the box. Fortunately, my fiancee is out of town for a week and then we are meeting up for a little vacation so I'll be able to run some nasty break in noise through this thing 24-7 for at least 100 hours. And of course when I am not breaking it in or listening to music I'll be playing Battlefield 3 so I will break it in with the (hopefully blissfully enhanced ) sound of mortars, machine guns, and screaming jet engines!
Oh yes, this week is WIN.