I"ve just my my Woo WA2 last week.... got some upgraded tubes, but using the stock ones at the moment.... black in colour..... after a couple of days is sounding very nice indeed.... I'm using it mostly as a pre-amp, MDac, and NA7004 network player feeding FLAC music..... the sound is both detailed and warm, with the Mdac providing a large dynamic range, including bottom end.... I'm very, very happy with the set up ... only one week old and less then 50 hours on the woo .....
for cans I have a HD650 with Moon audio silver cables... very nice, but I'm mostly listening through my speakers (monitor audio RX8).... nice bit of kit ....