I always was interested in the Porta Corda but I have this psychological price barrier at about $200 for portable amps, although this is starting to erode as I did buy the XP-7 at $400. In any event, when the group buy for the PCII was announced I had just sold an Airhead, SuperMini and a META42, and had cash in my PayPal account. Since I always wanted to hear the PCII, it was too good to pass up.
As for sound impressions, I was not overly impressed with the amp at first. I let the amp burn in for about 100 hours and its sound started growing on me. I find it to be very musical and detailed in the midrange. It is controlled and punchy in the bass, although not as punchy as the XP-7. Where it seems to falter a little is in the highs. They are not sparkly and clear and seem a bit recessed. Still, it is a fun and musical sound and seems to provide a good stereo image. It even makes my HD 25-1 seem to have some sort of soundstage. The crossfeed is an interesting option and I think the Porta Corda executes it well, it is subtle but noticeable, but that is not something that particularly interests me.
I figured that at the group buy price I could always sell the amp for close to what I paid and have the experience of listening to the Porta Corda. At this point I'm not sure if I'm going to keep it or not, as I also have a SuperMacro, but that is on extended loan to a friend of mine. Once I get it back I'll decide which amp to keep. I doubt I'll keep both of them.