Not sure about regulation, this one has a 3V supply as well I believe. A nice balanced valve output stage ala lampizator should help with the realism on vocals if everything else is almost perfect.
How does it compare with the new Wolfson 8741?
How much did you pay for this? I quite fancy playing with this one as well but the idea of queing up ready to press the buy button when Twisted Pear Audio releases the next batch is putting me off. There is no other way of getting hold of one these is there?