I currently have the HD800 and the Super II.  The combination is great and the extra power does truly make the headphone "sing".  In comparison to my Woo6 with Sophia, the Super II sounds so much more musical.  The highs, mids and low sound more true to what I am hearing from my speaker setup. 

Anyone have any good suggestion for tube rolling with the Super II.  Thanks  Hey does anyone notice how hot the power supply unit gets.  I mean you get even touch it for a long period of time.  Hope this is normal but I think there should be a little more ventilation for the heat to dissipate.  

Electro-Harmonix el84 and sovtek 12ax7.  I have some El84 gold pin and tung sol 12ax7 gold pin coming so I can make some comparison.  Looking to get Mullards now.  

After 8 weeks of waiting finally just got my Super II today and I must say it was worth the wait.  I have been listening to it for 2 hours now and even with the stock tube it sounds better than my Woo 6 with a Sophia tube.  Can't wait to do some tube rolling and see if I can tweak the sound even...