Check:
http://www.head-fi.org/forum/thread/428570/woo-audio-amp-owner-unite/8295#post_7271951
Xcalibur's post
http://www.head-fi.org/forum/thread/428570/woo-audio-amp-owner-unite/8280#post_7270639
Skylab's post
I currently have the EML 5U4G and the Sophia Princess. They are considered two of the best in production. They have a huge soundstage, but I'm having trouble matching them with my rather bright sounding W11R headphones. However, I'm stilling burning in the EML 5U4G. It's only been about 8 hours. Some of my friends really love the combo of the Princess or EML with my headphones. I guess I'm becoming more and more treble sensitive.
I have the Brimar and the Tung Sol 5U4G being shipped.