I have a V-twin and LOVE it!! It makes my old Fender Deluxe sound like a metal machine. It seems like it has just a touch less distortion than a Recto has, but it's still a metal monster. I'll run a tubescreamer in front of it sometimes to give it more distortion.
I've ran it through head phones several times and it sounds good, but I think it sounds best in to an amp or poweramp and that a POD or similar device sounds better with head phones since that's what they're made for, and in some cases the POD or Behringer V-Amp2 can cost less.
Thats just my $.02 worth.