I live in Finland. It cost a fortune
Woo6 is one of the cheapest. And I prefered it to Wa3, Wa6SE and Wa2 with something like HD600. It is quite special because it is with output transformer - very rare because it raises the price quite nice. But the subjective effect was immediate comparing to OTL designs for me (OTL sounds quite neutral, more SS like for me). Amazing punch, weight, big depth, epic organic, thick sound signature. Having audio transformer on output has advantage of low output impedance. Woo used impedance selector for low impedance headphones & high impedance. Another big advantage is that this is the safest type of tube amp for your headphones because there is no way to have DC on the output (unless of course you break transformer's insulation).
Listening to something like jazz with female vocal was breathtaking (for example Pat Metheny with Anna Maria Jopek album). One night I decided to continue listening till the morning next day. Could not stop listening to different albums. This never happened when using SS audio rig.
But from other point of view, I couldn't imagine some serious listening for classical recordings with piano, violins, cello. I would miss too many important aspects like focus, precision, separation of sections, transients handling (attack & decay), resolution, total lack of any distortion to not changing the timbre of instruments etc.
You can have -10% at Woo during black friday orders.